United Bank Of India [UBI] — Rund amount not refunded in my bank account

Address:

A296a, Ganganagar divider road,mawana road

Sir, I bought a product from Amazon on 21november2020 of amount 29999/-. The order was prepaid and transaction was done by my Visa debit card o[censored]nited bank of India.
After that I returned the product because it was not worth. Returned date was 11 dec 2020. Amazon issued my refund on 12th of December 2020. And they also provide me the refund reference no #74332740348034784591716 .
Now it's been 9 days amount is not credited to my bank account.
I request you to do something in favor of this. As soon as possible