Airtel Prepaid Mobile Service — Unauthosised deduction of charges from the mobile balance

Hi,
I am K.K.Agarwal & i have a prepaid connection of Airtel Mumbai no. [protected] & its a life time card.I stay at Lower Parel.Since last week SMSs on cricket scores have started coming to me and some charges/amount is deducted from my balance, as i have never opted for this service i request you to stop this alerts/ SMS service from immediate effect and return back the amount deducted from my balance to me. An immediate action will be appreciated.