Apple India — fraud

Address: 65/1 third floor savitri nagar ,mallviya nagar, New Delhi, Delhi, 1110017

Hello my name is Amrit tavetiya. I am using iphone 6s risght now.Few days back i faced battery issue in my device so, i went to apple service center in shivalik (south delhi) as my phone was under warranty.
Day one i visited there they just formeted my phone and asked me to use it as they confirmed that battery is OK.I used it for two days and my phone battery was given that same 3-4 hours backup.Then i again went there and they have taken the phone after checking but after 3-4 days they called me up and said that your display is non genuine and i have to pay 12000 rupees for repair and then i asked for the proof but they have just give me the bill and charged me 12000 rupees.i just wanted to complain that they have changed the display there only and charged me for the non genuine display.
this is totally wrong that my phone was under warrenty and these people charged me for underwarranty phone.