Punjab National Bank [PNB] — Refund not credited in Bank Account

Sir, I had ordered a product from Amazon for Rs.630 on 03 September 2021, but the order returned back to amazon since it got damaged in transit.
Then Amazon initiated the refund of Rs.630 on 08 September 2021 to my Punjab National Bank account, but the amount has not been credited in my bank account.

Refund Reference Number is SP0PIU7X0000KSM7VDJ6

I am getting no help from PNB Customer Care & Bank.

Please help me, since it's been more than a month since Amazon initiated the refund but still haven't received the money in my Bank account.