Nokia India — levying service charge in warranty period

Address:

500013

My name is laxminath, i have a nokia 6.1plus phone with a warranty till 30th august 2019, but due to a small scratch on the phone, they said warranty is void as the phone has fell from hand. They also said a minimum service charge is rs 350 and for any other parts it would be charged additionally. This service center is in diamond towers shop 13& 14, near taj tristar, secunderabad-500003.
My phone no is [protected]