Indian Bank — money refunded by amazon on 4th december 2019 but not credited to my account.

Address:

122001

I have cancelled an order from amazon on 4/12/2019 and recieved an email from amazon that the refund has been processed succesfully and it would be reflected by 9/12/2019 ie between 3-5 business days, but still i have not recieved the money. When i spoke with an amazon associate he said i have to fill a "charge dispute form" bcause it could be a problem at my bank side. I also contacted my banks customer care many a time but they say that problem could only be resolved by visiting my branch.
My refund reference number is : [protected]

Name: jatin yadav
Acc no: (Protected)
Mobile : [protected]
Bank : indian bank

Please resolve the issue!!!