On nokia lumia 710 handset their is offer for airtel of 2Gb data at 3G speed for 4 month T

Location/place: nagpur

Name of company/service: airtel,india

sir i have brought nokia lumia 710 from nokia priority,sitabulldi ,nagpur on 11 july 2012 . On this hanset their is offer for airtel of 2Gb data at 3G speed for 4 month This autoactivation process.but til now this benfit is not given to me .i request u to please activate this service. IMEI no is 352843052851208
EAN NO is 6438158389830
I have complaint on 198 for 8 times ,visit airtel office t times .and called on 121,12118,198,999 more than 50 times.i satisfied every basic information given to me from 198 .but activation not done.. So i request u to please activate this service. .