Consumer Redressal

We have purchased a mobile from S H Mumtazuddin, Brand Name: GABA (Manufactured by S H Mumtazuddin) on 14.03.2013. On that time we are going to purchase branded mobile, but their sales person convinced me to take this brand mobile with extra benefit from other branded mobile. After purchase this mobile with in 20 days first problem arise that is display not working, on that time they change the display board. After i have again visited their office two times for some minor problem, which has been shorted out same time. I have again visited their office in the month of August for some major problem, on that i have got my mobile approximate after 25 - 30 days. on that time they confirmed that now onwards it will working properly. At last i am again submit my mobile due to display problem. Now i have informed them that i am not taking this mobile any more, i want the replacement with some branded company. I have all mail Document if you required. Kindly Help me the same.