Consumer Redressal

I am a college student,i have bought Samsung Galaxy S advance on 20/03/2013,my cell phone is in warranty period,I gave My handset to authorized service center for 3 times in last 2 weeks due to the problem of system crash, every time they are giving me different reasons for same problem, today i went there for 4th time with my handset with live problem of system failure and claim a new handset but they refuse to do so and gave me a reason that i am using anti virus, and he even refused to repair my cell phone and insulted me by saying that \"the problem you are facing in your handset is not well defined\", and added that \"you can do anything you want, whether go to consumer forum or to court\" these are the words if the Service Center executive. They are cheating as well as spoiling my time and study. So plz help me in solving the problem My Job Sheet No is 4159912979 and the Service Center\'s Name is SHARP ENTERPRISE,African House,Topiwala Lane,Mumbai Ph. 23814743 Exe:Mr.Krishna