Bank Of Baroda — refund is not being reflected in account

A refund has been made by amazon on 14th of April regarding a product which i've buyed from the amazon. But the refund has not been received yet. Bank is saying no amount has been received by them. I've talked to them again and again but no responss is coming. So i nees 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.