Micromax Modu T mobile phone camera problem - not resolved

Since I have purchased it I am in a big trouble. It never worked fine . It started creating issue for me, initially there was an issue with Camera and incoming audio while talking. So i visited to the nearest micromax service center. Service center engineer was talking like that they do not know anything about the phone. They also were not able to check the issue at the same point of time and also realized me that I did a big mistake by purchasing the Modu T Micromax handset.

It took two months to resolve the issue and after the day 1 or 2 I faced the same issue and went to service center and now it has been 4 months that my phone is in service center.
I dont know what to do.