Apple India — Iphone 6s screen issue

Address: New Delhi, Delhi, 110060

Website: Consumercomplaints.in

I have handled my iphone 6s with great care and its still in warranty. There is not even a single scratch or dent on my phone. It has always been kept under cover.
Yesterday all of a sudden the screen has faded off. I took it to the service center where the advisor sadi that the screen will be replaced and i will have to pay for it as its a physical damage.
I made him understand that when there is not even a single scratch on the screen or on the body then how is it a physical damage.
It just happened suddenly that the screen started fading off.
I need a replacement of my phone.
I can afford to pay more for a already expensive phone.