Nokia / Nokia Asha311 — Harassment with Nokia Asha 311

Address:

South 24 Parganas, West Bengal

I bought nokia asha 311 in d end september 2012, within a week my phone started disturbing by hanging n restarting automatically when i am online in d CHAT application and sometimes even on offline. This problem continues in my asha 311 every day and it happens minimumly about 8 times a day. By compromising about2 months i visited nokia care centre to get rid of the problem and able touse my phone freely. But nokia care centre have never taken it seriously and they are just providing servicing by keeping my phone for about 7 days but nothing changed and they still providing me just service all the time and results are always same that is no good result after every service. They have taken my phone for 5 -6 times till date and kept it with them for about 7 days each time n one time send to Delhi service centre. . I am still facing the same problems and lot more as its increasing day by day. Now my phone does not support any headset sometimes. Please help me out by suggesting me a way that what should to get rid of this harrassments n can get cash back r replace my phone.
My email id: [protected]@gmail.com
My phone EMEI NO: [protected]
One of d job sheet of Girish Park Nokia Care:[protected]/121228/4