Indian Bank — Indian bank - refund processed by amazon but not credited to my bank account

I made an order in amazon on 19th May 2020 and cancelled it on 5th June 2020.

According to Amazon, they have issued this refund and processed it but it hasn’t been credited to my account.

They told me, as Indian bank is nationalised it may take 5 working days to reflect and if not then to call Indian Bank customer care. They provided me the reference number for the refund which I have attached in this message.

I called Indian Bank multiple times over the course of the day, and each time they told me to call back amazon, I even gave them my reference number for the refund but they have not took action. please help.