Nokia — internet is not working for 5 to 6 days

Sir,
My mobile nokia 216 and sim tata docomo no.[protected]. I has gone to nokia care in thousand lights (Near sathyam cinemas). He refused to service my nokia mobile 216. He advised me to go purchased shop. I approached tata docomo customer care 198, 121, 1909, 1900 but however internet is not working in my nokia mobile 216. I kindly request for resolve my problem.
Thanking you sir.