Amazon India — Product paid but not delivered

I ordered Lenovo Note 4 via order no.[protected] and the same was to be delivered by 13th June. Got a SMS msg that the phone is being delivered (11 June around 3 pm). No one was at home during that time. At night got a sms message that the phone has been delivered to myself. I was shocked and had a chat with the CSR who said he will investigate. So far I have heard nothing. On sending a reminder, either to deliver the phone or refund the amount, I get a response saying that there are no refunds and replacement is available for defect phones. It seems Amazon is playing a hard ball game. Also, beyond a shadow a doubt, the delivery man seems to have pocketed this phone. It seems Amazon is not serious to resolve this issue. Proceeding legally against them for cheating/scamming a customer for the product which has been paid in advance and not delivered.