[Resolved]  Nokia 6510 — paper keypad lights are not going to turn off,

I purchased 5610 Nokia mobile in august 5 2008. After 10 months, I faced a problem with this set.
Sometimes upper key pad lights are not going to turn off, so I have to restart the mobile every time.
Due to this battery back up is also very low.
After giving my mobile to services center, 1st time they updated my mobile version but problem is not resoled yet. Due to this I have given my mobile to the same service centre again. They did something. But I am still getting same problem. Now its 3rd time I have given my mobile to
Swarget pune new India telicom. Whenever I called them, they give me every time same reason as
Over computer is not working we don’t have power supply etc. But for the last time when I called them, they are telling that a part from mobile has to be replaced and they are not having it with them.
I am so much disappointed with the sercive from Swarget pune new India telicom ( Authorized service centre of NOKIA ).
Kindly let my