Bank Of Baroda — refund by amazon not received yet

Refund of rs. 1138/- has been made by amazon on 26th of march 2019 regarding a product. The amount should reflect in my account by 1st of april 2019 as directed by amazon. The authorization code (Refund reference number) for the transaction is 190501.

But, the refund has not been received yet. I've talked to bank but they are saying no amount has been received by them. So i need to file a"charge dispute" on them, to get the full details.
I need bank to resolve this issue as soon as possible or i'm gonna take some legal action.