Apple India — iphone 6s service centre scratch on phone

Address: Udaipur, Rajasthan, 313001

I gave my iphone 6s at "teasor systems pvt. Ltd, udaipur" as it was having a lot of problems. When i went to collect my phone, i found scratches on my phone for which i complained them. The first response form their end was that its a small scratch and it doesnt make any difference but when i said that it wasnt there when i submitted the phone then they put all blame on me. I have never met such dishonest people in my life.