Intex Technologies — Battery Back Up Problem - Intex Aqua Superb

I have bought a intex phone but its battery back up is worst.it takes 3 to 4 hrs to charge but it works only for 2 hrs...I got changed my battery 2 times form service center after that same problem is here. I am facing this problem since first day of the purchase of mobile. Now i have subbmitted my phone to service center to repair because they were saying that in this phone having some heating problem and we will send it to head office for repair. Job sheet No[protected]T001 Now i want please take back this phone because this phone battery back up is worst not able to work with this even two hrs so there is no use of this. Please Resolve my problem ASAP. I m facing this issue from last 6 month and i have wasted my Rs 6400. Thanks Manish Contact No [protected]