Amazon.in - Defective Handet Delevered Misguided Service

Purchesed * Plus * Handet from Amazon.in. Product delevered defective. *st check was done via online customer support from the * plus team ( mobile company). *nd check done by Amazon Technical Support via call. Its was a marathon check at these two point * plus team on first check tried everythng and finally declair the handset defective and ask me to return to the seller. But again *nd check been done from Amazon Technical team and finally next day they too said, handset is defective. The Technical support ask me to return and explained the process, the process explained by him was simple as he asked me to courier back the handset to the seller ( third party). He aslo assure me the courier charge refund. I did the same and send the courier reciept and all other documents on their mail.
Yesterday I recieved a call from the courier DTDC that the seller is not accepting the courier. When contacted Amazon customer care, the checked and said that since u didnt followed the right process of return, the product is not accepted by our warehouse.
As per them i need to put a barcode and a declairation format that is been sent to me on the box before courier.
While my final discussion with the Technecian he never said any such process.( this can easily be listen on the recording of my conversation at amazon call center). That person also assured me that the replacement handset will be well checked before delevery this time.
This clearly conclude.

*. First time the product was not checked and defective product been dispatched.
*. The misguided me about return process further delaying
*. They doing mistake and asking me to follow tgeir rigid process. Not eager to go one step ahead to satisfy a customer who has already taken so much pain.