Apple India — IPhone 5s 32gb display issue

Address: Bangalore, Karnataka, 411057

I am very disappointed by the apple as I have purchased an iPhone 5s space grey 32gb which is under warranty from Pune. One day suddenly after putting back a call my phones display went from white to slightly red.
I went to authorised apple service centre "Unicon infosolutions" Pune they have submitted my phone but keep prompting me that you phone has dents but I told them that my phone has never fallen down. It's been six days the concerned person called me and said that we are not able to make it you have to pay 20400 RS to take up the new phone.
This is very ridiculous thing from apple I have never expected such a thing from such a big company.
The service provider has rendered the images and now I have no idea what to do.