Bank Of India — refund for my cancelled amazon product

Address:

1/2/2 Botanical Garden Lane. Shibpur Branch.

I ordered a product on amazon on 9th august and paid using my bank of india debit card. I cancelled the order on 10 august and amazon stated the money will be refunded to my bank account in 2-5 days. But even after waiting for the allotted time when the amount was not refunded to my account i contacted amazon and they said that the refund was already initiated from their end. But was not added to my bank account therefore the bank must be the reason.