Corporation Bank — I'm complaining about the refund money of an amazon product

Address:

Chikkabanavara

We ordered an online product from amazon on february and we returned it. We requested for the refund. We got the confirmation from amazon shopping that the refund is initiated but didn't receive any message from the bank that amount is credited.
Refund reference # 74332740053005265524371
This was given from amazon on march 2nd.
The bank said they changed the software and gave reasons but didn't tell us about the refund details or status. Amazon said they didn't receive anything back from bank and from their side the procedure was done.
Pls look into this issue as soon as possible.
Thank you