Punjab National Bank [PNB] — refund not reflecting in account

Refund of rs.549 and 449 was processed on 5/31/2018 by amazon and it has been eight days but the amount is still not reflecting in my account.
The authorization code (Refund reference number) for the transaction is 317330.
Contacted customer care thrice but no action has been taken by them. They said that they can't fetch my details due to technical problem and ask me to call them back after sometime.