Blackberry — no voice

Address:

East Delhi, Delhi

Sir i buyed B.B 9810 on 30th sep 2011 in evening and problem arises on the same day.

Problems-
Handset looses its voice means when any call comes the phone doesn't ring & if i pick up the call i cant able to listen any voice & the other person on the other side also can't hear me & when i restart the phone with removing the battery then it works for some time & then same problem comes again.
Hangs up
Very low battery back up
Optical scroll not working properly