Punjab National Bank [PNB] — Refund initiated by Amazon not received in Bank account.

Address:

263645 Sadar Bazaar Ranikhet (District): Almora

1 month ago returned the product from Amazon of rupee 979.0 the returned amount should reflect on my bank account on 5 business days but it has been 22 Days since I have complained Amazon as well as Punjab National Bank but no one is able to help me. I'm going through a financial crises these days and no one is able to help me.
Amazon gave me proof that they have issued the refund amount on my bank account by sending me the RRN (Refund Reference Number): SJDXMW5T0000KSGMBJVL
In case you do not receive the refund by the expected credit date, please contact the bank's customer care and mention the below RRN. But bank is unable to help me.
I'm in a financial crises and need your help in scrutinizing the error and refund the amount back to my bank account . It would be grateful if this could be done without further delay as i am undergoing a financial trouble these days due to recessive business.