Apple Care — Not resolving issue related to hardware and manufacturing defect

Address: Bangalore, Karnataka, 122001

Website: www.apple.com

I had purchased iPhone 5s in February 2015. Since July, it started giving flickering issues, once the company changed the phone by giving me new phone and said, they had given exception chance, apart from this, now in the month of October phone is again troubling me, by which apple is denying to change or resolve the issue by saying I have dent on the phone which is only a scratch. And said, exception chance can only be given once. Though the phone is under warranty, no action is being taken yet. I am facing mentally harassment by iqor system in Kamla nagar, Delhi and Iphone support care in Bangalore by Rukhsar the senior manager along with her colleagues. Even that lady that spoken so badly with me, which was not supposed to be with a customer. I am not asking them to replace the phone but atleast resolve the hardware issue which is troubling me.
Kindly help me in resolving the issue.