Lenovo — Regarding mobile phone warranty

Address:

New Delhi, Delhi, 110025

I bought a mobile phone lenovo vibe shot on aug 2016 cost rs 18200. It has 1 year warranty. The service centre are creating their own issues that they will not send my mobile under warranty unless until i pay them 6900 rs for physical damage. My phone doesn't have any type of physical damage. The service centre executive opened my phones back pannel and returned my phone unfixed. They also create an issue regarding my bill. Which is from well authorised dealer. The issue in my phone is only jst a network problm nothing else.