Airtel — activating service without permission

Address:	Bangalore, Karnataka, 562157
Website:	airtel.in

I got message on 20 apr that some fun music service has been activated on my number and 30 rs is been deducted for that. After 4 days i again got meaase that it is been renewed and again 20 rs was deducted from my balance. Is this the way airtel is earning money. Without customer's permission how services get activated, i dont understand. This kind o[censored]nproffesional behaviour was not expected by airtel