Karbonn Mobiles — Battery problem

Address:

Chennai, Tamil Nadu, 600040

I have purchased a karbonn mobile on 9th aug in cheenai at poorvika mobile store. battery is draining very fast without even using for voice calls. though went to nearby service center and complained twice the prob is still persisting. they take 10 days each time to repair. i need an immediate solution fo this, could this prob solved? or do any other alternative