BALANCE REDUCTION WITHOUT MY SUBSCRIBING

since 10 days i m receiving sms from AD54321 - YOU Have been renewed for full track subscription service from airtel.you have been charged rs5.latest games http:   and almost daily 5 or 1 rs is deducted from my balance .I have never subscribed for these services.please help me unsubscribe.i have already lost 100s of my money,please help me unsubscribe.  MY NUMBER-9862921339