Amazon India — Delivery status showing delivered but haven't received the product.

Address:	411062
Website:	amazon.in

I ordered a Moto g 4 plus phone and I received a defective piece. I placed a return on the same day itself. Now when I tracked the product it is in delivered status but I haven't received the phone. Moreover the customer care executive are very unhelpful and not able to give any information. I checked on the courier website and it shows that the product was returned back. When I called amazon they are not even aware what's happening. Moreover, I have already paid for the phone.
Very bad service and response. No reliability