Nokia603 — problem on Handset (mobile)

Address:

East Delhi, Delhi

Sir,
I have bought my mobile phone on dated:13/may/2012 & my IMEI no is:[protected].
My mobile has audio problem after 10 to 15 minutes of continue conversation & it has charging problem because i have to connect my charger on my mobile around 4 to 5 times then it work.And after power cut i have to remove my charger from the mobile then again pluc in 4 to 5 times I made complaint around 8 to 9 time to a Nokia care centre its name is Saksham services A-1,First Floor,Acharya Niketan Mayur vihar Phase:-1 new delhi,phone no:[protected].
They have sent my mobile to Nokia Head office around 4 times despite my problem is as well.Head office given me complaint number when i requested him so many times :1st no: 1-[protected]. 2nd no: 1-[protected].
Head officeno:[protected].

Thank you