HTC India — Htc desire 728g always switch off

Address:

679325

I Aravind P bought a htc desire 728g 5 months back .. after 1 month itself the phone showed some complaints like overheating, switch off while ringing etc.. that time it was not a serious problem but now from last 2 weeks the phone is not working completly always it is rebotting... i had given to so many service centres and they are also telling this is the core complaint of this phone and they cant do anything... they cant even change the software. please suggest me what can i do with this handsetDD