Amazon India — Laptop wrong invoice multiple times cause of failing service benefits

Address:

Faridabad, Haryana, 121005

I purchase a lenevo g50-80 laptop on 8 nov 2015. There is an offer from lenevo 2 yr warranty extension at this period (Till 7 dec).
I applied for this but they canceled it because of wrong invoice.
I reapplied for this but they again canceled because of delay in documentation (That is actually delayed by amazon for 2nd invoice).
Because of that they agree to return item but actually they refuse to return.

Today i found that from the lenevo service center reference, amazon provide me 2nd invoice also wrong.

That is the actual reason of my warranty cancellation because i applied for this 6 dec one day before offer end.