United Bank Of India [UBI] — Refund processed from amazon but not reflected in my ubi/pnb account

Address:

Branch Fateh Nagar

I paid for a product on amazon the refund has been initiated by them and it is still not reflecting in my bank account number[protected]
On contacting the bank branch they said we dont know about this and please raise a complaint online after many failed attempts to find a website o[censored]nited bank/pnb to file a complaint i am writing here, the refund reference number is 75260820361044687406388. Please get this sorted asap as the same issue happened with me in may 2020 also and i have not yet got the amount for that also. The name on my bank account is Naitik Adlakha