Ample Technologies — product under warranty didn't get repaired

Address:

560035

My iphone 6s is stopped functioning and been surrendered in icare service center for repair, and the product is under one year warranty. But they rejected the warranty saying the product had a crack in the rear camera. Which had happened long back and the camera was functioning well and it has nothing to do with device failure. I don't want the camera cover issue fixed i want the phone in working condition, which they agreed to do only with paid service.