PNB — Refund initiated by amazon but not credited to my bank account

Address:

punjab national bank , KL-44, kavi nagar branch, ghaziabad, uttar pradesh, 201001

1.) I had purchased an item from amazon on 19th jan 2021.
2.) the order id of the item was :[protected] .
3) the price of the item was Rs 9899/-
4) but due to some issue with the product I had to return
the product .
5) my product was picked up for return on 2nd of Feb.
2021 and the refund was also issued on the same date.
6) but till today the refund has not been credited to my
bank account.
7) I also contacted pnb customer care but they were
not able to help me .
8 ) it has been more than 18 days since the refund got
initiated but i have not received it in my account.
9) Amazon has provided me with refund reference
number to track the refund
10) the return reference number is :
30005110191019164329896
11) my bank account details are :
Name: NIKET KUMAR
ACCOUNT NO. : [protected]