Nokia 6600 Slide — Handset not working

Hi I had purchased a Nokia 6600 slide on Feb - 09 and since then i have been facing issues with the handset like continous heating while call , hang , keys not functioning , not able to start the phone , delays booting more than 10 minutes , voice clarity , loud speaker low, ringing volume low , not able to use and browse net services, very slow , not able to use the menu options, head set voice not clear , games get hanged, the saved games vanishes , the list is on and nothing has been done from NOKIA `s end to cure these ploblems .. I have submitted my handset 4 times to the Nokia care and they have had the handset for more than 2 months and tilld ate teh problem is not cured..

Pls help My phones IMEI number is [protected]