Apple India — Rude staff with no responsible replies

Address: Surat, Gujarat, 395007

My iphone 6 was replace with fees last year june-2016, and it was working good then my display was broken and we repaired from apple authorise service station in feb-2017 after one month of that suddenly our phone was not able to join any network and it keep on showing status "searching". Which we showed to service station looking to that staff inform us as this phone is purchase in malaysia so warranty is still valid and we can go and change there.. But after we check properly we found warranty was long time back expired. So we decide to replace our iphone 6 by paying fees, but today when we request for replacement they are saying that we got open this phone somewhere outside. So we cannot replace it. I explain them that we have never ever given phone to anybody or nor we had tried to get repair from out side.. But they were very rude in talking especially there manager (Mrs priyanka gangully) who did not showed courtesy to come up and talk just inform her junior to say that cannot replace.
We argued that as phone was open in there service station only for replacement of display so may be they damage it.. But they speak confidently that they are not allowed to damage... So how to believe who is right.
We want solution for this matter, we are ready to pay replacement fee and replace phone... One thing they have to think that already we have replaced phone for rs 24800 once then replace display for rs 13500... After spending so much money will i go out side for cheap repair.. Sometime they have to see buyer back ground and then reply just cannot ignore and talk harsh way.

We are being called apple family as full family have all apple devices.. And finally today face such thing make really upset and rethink to use apple devices.

We would appreciate to received favorable reply with solution.

This incident happen at
I venus (Authorised service station)
Based on ring road surat
Gujarat india

My name is kishan and my contact number is +91 [protected]

Regards
Kishan