Punjab National Bank [PNB] — Punjab National Bank [PNB] Refund is initiated by Amazon but still not credited in my bank account

I am writing this to complaint about the refund of amount Rs. 1798 against my order with Amazon. The amount of Rs1798 is required to be credited to my PNB account by 26th December 2020 and now it's 31st Dec 2020 and credit is still not appearing in my account despite various follow-ups with bank and amazon customer care. Please help me in this matter. Amazon representatives are saying that refund has been successfully initiated on 21st Dec 2020 for the total amount of Rs. 1798 and the reference id is 5134040357029770846832
5134040357029770846832
The charge is stuck at bank end. And when I called up at bank customer care they saying the can not check anything like this and cannot even fill the charge dispute form.