Consumer Redressal

I had submitted my HTC Desire 820 to the service center for repair on 31/01/15 as it was not functioning properly. After following up with HTC I finally got my phone on 19/03/15 and when I checked it it had the same problem and the service center representative said I have to deposit it again for another 20 days. I submitted the phone on 25/03/15 again for repairing and I was assured that I would get a new replacement but I did not get, instead they said it's gone to Chennai for repair second time and I have still not got back my phone. I bought the phone on 08/11/14 for Rs24,000 and I'm not able to use my phone. I want to register complaint against HTC India and TVS Electronics(HTC Service Center) for continued mental and physical harassment. Please look into the matter as soon as possible as it's already been over 2 months.