Swipe Telecom — service center refusing to repair my phone under warranty

Address:

New Delhi, Delhi, 110071

I never dropped my phone intentionally or accidentally, i still remember it happen suddenly while using, half of lower touch of my phone is not working including navigation bar... When i tried to repair it at service center (Delhi) under warranty, they refused to repair it & demanded rs2600 & the silly reason the explained was i must have dropped it somewhere,
I mean seriously??, it happened while using the phone, i never dropped it. The lack of service commitment of swipe is astounising.
Plz help me out here or i'll gonna file a f. I. R against swipe mobiles... For they are looting the customers by their fake products...