Karbonn Mobiles — From service center i am not getting my phone back after duration of 45 days

Address:

Raigad, Maharashtra, 410206

My phone was facing problem of "POWER ON" and it was under warranty. I gave my phone at karbonn service center for about 40-45 days and i am not getting back my phone after such a long duration of time. The service center says that "Your phone is with company so we cant help it".
So, i request you to give our mobile in working condition as early as possible .
Otherwise we may file a complaint in consumer court.