[PERFORM] query runs for more than 24 hours!

Hi, I have a query that I run in my postgresql 9.6 database and it runs for more than 24 hours and doesnt finish.

My select consist from few joins :

SELECT a.inst_prod_id,
                                           product_id,
                                           nap_area2,
                                           nap_phone_num,
                                           nap_product_id,
                                           b.nap_discount_num,
                                           b.nap_makat_cd,
                                           nap_act_start_dt,
                                           b.nap_debt_line,                                          nap_act_end_dt,
                                           b.row_added_dttm
                                           b.row_lastmant_dttm,                                   FROM   ps_rf_inst_prod a,
                                    AND    a.setid  || ''= 'SHARE'
                                           nap_ip_discount b                                   WHERE  nap_crm_status  = 'C_04'
                                    AND    b.nap_makat_cd IN (SELECT term_code
                                    AND    b.setid  || ''= 'SHARE'                                   AND    a.inst_prod_id = b.inst_prod_id
                                             AND    start_date <= b.nap_rishum_date
                                             FROM   tv_finterm                                            WHERE  pricing_method_code in ('2', '4')
                                             AND    coalesce(end_date, to_date('01/01/2095','DD/MM/YYYY')) !=
                                             AND    coalesce(end_date, to_date('01/01/2095','DD/MM/YYYY')) >=                                                   b.nap_rishum_date                                                   start_date)
                                    AND (b.row_lastmant_dttm >  to_date('01/01/2005','DD/MM/YYYY') OR
                                    AND    b.nap_act_end_dt > clock_timestamp()                                   AND    TRUNC(b.nap_act_start_dt) < TRUNC(b.nap_act_end_dt)                                         b.nap_rishum_date > to_date('01/01/2005','DD/MM/YYYY') OR
                                             WHERE  PERCENT IS NOT NULL
                                          b.row_added_dttm > to_date('01/01/2005','DD/MM/YYYY'))                                   AND   b.nap_discount_num IN (SELECT k.discount_line                                            FROM   tv_discounts_details k                                            AND    k.start_month = 1)
                                                        AND    c.phone = a.nap_phone_num
                                    AND (NOT EXISTS(SELECT /*+index(c TC_FINTERMS_I_SERVICE) */                                                        1                                                       FROM   tc_finterms c                                                       WHERE  c.area = a.nap_area2                                                       AND    c.term_code = b.nap_makat_cd
                                             WHERE  service_uid = (a.inst_prod_id)::integer
                                                        AND    deb_cred_line_no = b.nap_debt_line                                                       AND (payment_end_date > clock_timestamp())                                                       AND    term_type = '2')                                   OR  NOT EXISTS(SELECT 1                                            FROM   ip_service_discounts                                            AND    service_code = b.nap_makat_cd
                                              and  b.nap_purch_instprod  = ' ';
                                             AND    discount_code = b.nap_discount_num
                                             AND (end_date IS NULL OR coalesce(discount_end_date, clock_timestamp() + interval '1 days') > clock_timestamp())))

Before trying to work on performance I checked locks and nothing returned :

=# select a1.query as blocking_query, a2. query as waiting_query, 
        t.schemaname ||'.'||t.relname as locked_table from pg_stat_activity            
        a1 join pg_locks p1 on a1. pid = p1.pid and p1.granted join pg_locks 
        pg_stat_activity a2 on a2. pid = p2.pid join pg_stat_all_tables t on 
        p2 on p1.relation = p2.relation and not p2.granted join         p1.relation = t.relid;
     (0 rows)
        blocking_query | waiting_query | locked_table
        ----------------+---------------+--------------

I checked the explain plan of my query :

 Nested Loop Semi Join  (cost=0.43..7565655389.26 rows=1 width=93)
   Join Filter: (b.nap_discount_num = (k.discount_line)::numeric)
         ->  Seq Scan on ps_rf_inst_prod a  (cost=0.00..4337158.91     rows=40452 width=41)
   ->  Nested Loop  (cost=0.43..7565653159.07 rows=2 width=93)
         ->  Index Scan using ps_nap_ip_discount on nap_ip_discount b      (cost=0.43..186920.69 rows=1 width=60)
               Filter: (((nap_crm_status)::text = 'C_04'::text) AND     (((setid)::text || ''::text) = 'SHARE'::text))
               Filter: (((nap_purch_instprod)::text = ' '::text) AND     (nap_act_end_dt > clock_timestamp()) AND (((setid)::text || ''::t
               Index Cond: ((inst_prod_id)::text = (a.inst_prod_id)::text)
e('01/01/2005'::text, 'DD/MM/YYYY'::text)) OR (nap_rishum_date >     to_date('01/01/2005'::text, 'DD/MM/YYYY'::text)) OR (row_added_dttm >
ext) = 'SHARE'::text) AND (trunc(nap_act_start_dt, 'DDD'::text) <     trunc(nap_act_end_dt, 'DDD'::text)) AND ((row_lastmant_dttm > to_dat
                 ->  Index Scan using tc_finterms_ix1 on tc_finterms c  (cost=0.56..8.60 rows=1 width=0)
 to_date('01/01/2005'::text, 'DD/MM/YYYY'::text))) AND ((NOT (SubPlan 2)) OR     (NOT (SubPlan 3))) AND (SubPlan 1))              SubPlan 2
 b.nap_makat_cd) AND (deb_cred_line_no = (b.nap_debt_line)::double     precision))
                   Index Cond: (((area)::text = (a.nap_area2)::text) AND ((phone)::text = (a.nap_phone_num)::text))                  Filter: (((term_type)::text = '2'::text) AND     (payment_end_date > clock_timestamp()) AND ((term_code)::numeric =
                       Filter: (((service_code)::numeric = b.nap_makat_cd)     AND ((discount_code)::numeric = b.nap_discount_num) AND ((e
               SubPlan 3                ->  Index Scan using ip_service_discounts_pkey on     ip_service_discounts  (cost=0.56..10.78 rows=1 width=0)                      Index Cond: (service_uid = (a.inst_prod_id)::integer)
                       Recheck Cond: (((pricing_method_code)::text = ANY     ('{2,4}'::text[])) AND (start_date <= b.nap_rishum_date))
nd_date IS NULL) OR (COALESCE((discount_end_date)::timestamp with time zone,     (clock_timestamp() + '1 day'::interval)) > clock_timestam
p())))                 SubPlan 1                ->  Bitmap Heap Scan on tv_finterm  (cost=2290.83..17301.61     rows=26907 width=4)
                       ->  Bitmap Index Scan on index_test_mariel      (cost=0.00..2284.11 rows=81126 width=0)
                       Filter: ((COALESCE(end_date,     (to_date('01/01/2095'::text, 'DD/MM/YYYY'::text))::timestamp without time zone) >=b.nap_rishum_date) AND (COALESCE(end_date, (to_date('01/01/2095'::text,     'DD/MM/YYYY'::text))::timestamp without time zone) <> start_d
ate))
(25 rows)
                             Index Cond: (((pricing_method_code)::text = ANY     ('{2,4}'::text[])) AND (start_date <= b.nap_rishum_date))  ->  Materialize  (cost=0.00..1407.38 rows=43933 width=4)        ->  Seq Scan on tv_discounts_details k  (cost=0.00..1187.71 rows=43933 width=4)
               Filter: ((percent IS NOT NULL) AND (start_month = 1))

I run vacuum analyze database before running the query. Some info about the tables :

ps_rf_inst_prod - 32G 
nap_ip_discount-1G 
tv_finterm - 100M
tc_finterms - 6G
TV_FINTERM -  1G

This query is part of an app that I migrated from oracle to postgresql. I dont want to change the query much, looking for a way to change the plan to make it faster.. I have indexes on ps_rf_inst_prod, when I delete the pipelines in :

  AND    a.setid  || ''= 'SHARE'
  AND    b.setid  || ''= 'SHARE'

the plan is changing and it uses indexes on ps_rf_inst_prod but it costs more and the performance are worse.

Please , HELP...