Amazon India — Payment using Amazon pay did not go through to merchant but was deducted from bank

I made an insurance premium payment using Amazon Pay. The page showed technical error and merchant did not get the amount. It was however deducted from my HDFC account. When I called HDFC they highlighted that the transaction was successful on their side and the amount is already sent. Each sidr is blaming the other and I'm not sure where the money went. Please help me to get the amount refunded.