Consumer Redressal

I had purchased a BlackBerry 9300 in June 2011. There were many issues and problems in that. I approached the service center. After rigorous chasing, I got it replaced. The problems subsisted in the replaced handset also. Again I approached them. I got it replaced again. But the problem subsisted in third handset also. Since then I have followed up them many-many times. But, they are not responding at all. I have tried contacting the sales team as well but, no satisfactory response. Now, it has been more than two years of sufferings since I bought it. After spending Rs.15K, I’ve got sheer problems and harassment. Being in Mumbai, I have visited the service center many times, at least 6-7 times. It has been really very painful and exasperating. I haven’t got the solution yet though I have sent them the pictures of my device showing problems. I am a working CA and due this problem I had to lose my business data twice, which has caused damage. Kindly help!