Amazon India — Amazon Refund initiated but not credited to bank

My name is Kashish Raj and I had ordered 2 Crompton Arno Neo 10-L 5 Star Rated Storage Water Heater with Advanced 3 Level Safety (White) of INR 9478.0 in Amazon on 23 october 2022, order id :[protected], among the two water heater i returned one of them as it was defective item on 11 Novemeber 2022 . And on 23 November 2022 Amazon initiated refund of amount INR 4739 to my card but I still didn't get the money. On enquiry i got to know RRN number is not getting generated, it 's been a over month but not getting my refund . So please kindly respond to this complaint it's very urgent.
Thanks you sir