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

I have order earphones from Amazon on 13 dec 2021 of rupees 1999 and it's order id is[protected]).
For some reason i have to replace it and get my replacement on date 16 dec 2021 (Order id[protected]). But due to some defect in the earphones i have to give it back again to the amazon and apply for my refund back.
For my refund they replied that my refund of rupees 1999 has been returned into my bank account on 23 dec 2021 but i didn't received in my account.
They provide me the refund reference number[protected] for the transaction.
Please help me to get my refund back.