Consumer Redressal

I purchased a Micromax A89 mobile phone on 27/04/2013. After 2-3 months of usage, the phone suddenly went off and was not charging as well. I submitted the phone at R.K. Services, authorized service centre of Micromax as it was under warranty. I got back my phone after 3 months in working condition. Again after 4-5 months of usage, I faced the same problem. This time I submitted the phone at another authorized service centre of Micromax, Sun Infosolutions at 17 Ganesh Chandra Avenue, Kolkata-700013, on 19/04/2014 as the phone was still under warranty. Since then till today, it has almost been 7 months that I have not received my phone. Whenever I go to the service centre, they say it will take another 1 month to repair or parts unavailable. I asked for replacement of the product which they very bluntly disagreed to. I have visited the service center about 7-8 times during this period but each time they gave the same reasons. Kindly help me in getting a replaced phone or refund. Thanks.