Nokia 6600
Unwanted Renual of Yahho zone

I received messages from Airtel service NOs 58243 and54321 every week stating that renewed for yahoo zone and charged Rs/10 each.i.e for month 40 40 added in bill. I dont want this yahoo zone and I never made request for yahoo zone. Why are you sending? I reported to call centre. No use. Still continueing messages. I wont pay bill and I will proceed legally. My mobile No:9989308366