United Bank Of India [UBI] — Refund not yet credited

I had cancelled a product on Amazon online shopping app on 09/12/2020, and the amount Rs.300/- I paid during the time of purchase was initiated for refund to my United Bank debit card on 10/12/2020. And again on the same day 10/12/2020, I received a message that, Refund success on Visa card : 300 INR.
But till date I haven't received Rs.300/- in my bank account. Please find the RRN number for your reference- 74766510345049477615361.

Also find the screen shot of the transaction status in Amazon.

Please help in getting my money back into my account.

Thanks,
Rakshitha