Indian Bank — Amount is not credited back

Good afternoon sir/mam,
I have purchased a wed grinder from amazon on 07/05/2020 by making payment of 3, 599 through indian bank debit card. I
Have cancelled an order from amazon on 08/05/2020 and recieved an email from amazon that the refund has been processed successfully and it would be reflected by between 2-4 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" because 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 : 9o3eem6v0000k9laha3p

Name: kulandai yesu g
Acc no: [protected]
Mobile : +91 [protected]
Mail : [protected]@gmail.com
Bank : indian bank

Kindly resolve the issue