Airtel mobile prepaid
Unsubscription of debtor subscription

I have been getting sms for renewing debtor subscription service from airtel and deducing Rs. 5 everyday. The problem is I am unable to unsubscribe this debtor subscription service through 121 CC service. The CC people told me its gprs related subscription, deactivatin through 121 won't work. Please help me to unsubscribe this debtor service, my mobile number is 961262670.

thanks

roshan