HTC Mobile — Not cover in warranty ( phone fire during charging )

Address:

Panchmahal, Gujarat

I was purchase htc desire 616 on 14/10/2014. And during charging phone was fire on 03/08/2015. I was submitted my phone on 04/08/2015 in service center(tvs electronic ltd - nr. Shamal cross road, ahmedabad-15). Then i was wait for reply but not getting any reply from service center. After few days i was call to service center for my phone status but they inform me service center wait for company reply for your phone is covers or not in warranty. Then i was call to customer support toll free number for help. They note my complain but till date not getting any reply. So, i was call service center they inform me your phone is not cover in warranty and if you want to repair the phone the cost of rearing is rs.7500/- . So please help me what to do for my phone .