Amazon India — refund not credited in my account but issued

I had ordered a speaker for 3000 inr and then cancelled the order for a refund.
The amazon team has issued a refund but the amount is not credited to my account. They ask me to speak with my bank cutomer care centre and follow steps to check if the money is credited to my account but they do not have any proof of the refund and it doesnt reflect in my bank account statement. Getting back to amazon they say they have refunded the amount but want to talk with the bank again. I have tried almost everything but i am unable to resolve this issue.