HDFC Bank — Refund not received on debit card account

I contacted amazon about my refund issue. They said that their refund is processed and money will be reflected in bank account within 4 days. Its been 5 days since my amount isn't refunded. I contacted amazon and they told me to ask from the bank end. Hence please i want to know about this from the hdfc is there has been any requests of refund acceptance or not.