Punjab National Bank [PNB] — Refund initiated by amazon but still not received

I ordered some grocery items from Amazon on 19.03.22 and made payment of Rs.1879.60 through AMAZONPAY UPI from PNB account. Order ID is[protected]. But among those items one item i.e. Vedaka Premium red Masoor Whole(1kg) was defective and I Claimed for a refund from Amazon. The initiation date of refund was 21.03.22 and the amount was rs 411.04. They initiated the refund of that amount with the Refund Reference Number[protected] but the amount is not credited to my account still now. Bank customer care is telling that they don't have any provision to check with the reference number. Please look into the matter and help me to get the amount.