Nokia, Mobile Nokia 500 — replacement of n 500

Address:

Durg, Chhattisgarh

I have purchased my handset nokia 500 bearing no [protected] from m/s bhomiyaji electronics ,2/5 akashganga supela ,bhilai,durg on dated 04/12/2011.somtimes the phone hangs and reboots automitacally.on dated 11/08/2012 i contacted the service centre they repaired but the problems occurs again on dated 12/08/2012, i again contacted service centre they send it to company on dated 29/08/2012 they handed over the set to me .After using i found that the problem still persists now i am again going to service centre ,this repeated process causing harresment and mental agony ,so i want a new hand set in lieu of the defective set
thanks
Goutam konar
mob no [protected]