[Resolved]  Nokia India — Replacement of Device

I bought a Lumia 730 Dual sim phone on 23 Oct'2014. And just after a few days it started to turn off itself like 5 to 6 times a day. I visited the service center on Nov 22, 2014 for the first time to get y problem fixed and since then it's been 1 and half month that I have been asked to submit my device again and again to the service center for repairing(in which device has already been sent to head office also) but they were not able to solve my problem. Now I when I asked them to replace my phone which is still in Warranty as on date (12Jan, 2015 ) they keep on asking me to submit it for repair without promising that if they will fail to repair they will replace it. And I can't spend my whole warranty period leaving my device in the service center for repair. I have all comaplint numbers and written chat saved with me but I don't know where to file a complaint. My phone IMEI is [protected]