Karbonn Mobiles — Mobile manufacturing problem

Address:

Alwar, Rajasthan, 301001

I have A90 karbonn mobile.
GSM 900/1800Mhz
IMEI: [protected]
IMEI: [protected]
Ref No.[protected]
SN: TEMA[protected]
i had purchased this mobile one year ago.i found the problems in my mobile at the same times that mobile battery is not run till long times. And mobile are switched off again and again. Hanging problem and I have done full battery charge and after some time mobile are switched off. Very often shown at the service center.now I m very tired. Please tell me about that problem.