Amazon India — Refund not initiate after pickup

I ordered a watch. But received different. I complain this to customer care. They created a return. Next day product picked up. now not ready to refund the money saying have sent incorrect product. I am calling customer service they said this matter stands cancelled not able to tell even what incorrect product have sent back. I have given back the same watch I got even it is recorded in my cctv also. But amazon customer servie is not bothered to look into the hassle customer is facing. Very sad to know that amazon is such a big company is doing this. Delivery boy has taken photos also when he came for return why don't u check those photos.