Lenovo — service of lenovo z2 plus z2132

Address:

722102

I purchased a mobile phone (Lenovo z2 plus z2132) from cyber king bankura for my son on 30.06.2017. Since last two weeks it has been seen that the upper part of the screen is not responding to touch. Unfortunately since yesterday the phone is not getting switched on. Today my son approached to lenovo service center at bankura. He was told that it will cost rs. 4000.00 for screen and the rest estimate will be given later on. The phone is within 6 months of warranty period. I dont know what to do with this phone if the repairing cost is almost half of the price of the phone that even within warranty period then i fear what will happen later on ie after ther warranty period.
Please do the needful.