Nokia — problem of screen touch and hanging of oviya

Address:

Satara, Maharashtra

sir...
Six months ago i was taken a nokia C5-03 screen touch phone.
In this phone the main critical problem is screen touch pad is faluty and also the ovi'a is hanging.
I was submited in nokia customer care about 6 times but they not solve the problem and last few days same problem occure and i give phone to the nokia care again.this problem can not solved so please give me replacement early.This phone was 4-5 months in nokia care and also this phone in nokia care they dont solve the problem properly.
i hope you give me a replacement because you dont solving the problem.
please give me replay....fast.