IDBI Bank — refund has not been credited

The refund provided by the amazon have still not got credited in my account fully. Some of the amount had been credited, some of the amount is still pending from november, 17. Refrence no[protected]. The amount against this refrence no has been initiated was rs. 5937 but i received only 3567, rest is still pending. The amazon has provided me the proof that the refund was iniatiated in the month of november itself by them. According to them they have checked it properly that the amount have been refunded, so the amount for which credit has not been received is stuck with my bank only. So its a fault on my bank side. Even they have provided me the refrence no. As mentioned above against which they have refunded me the amount of rs. 5937 but i didnt received the amount the said amount. I just recieved total amount of only rs. 3567 and amount of rs. 2370 is still pending since november. Provide me my amount asap. I had contacted the branch and even to customer care but no response from their side.