Airtel
Hello Tune Charges without my Knowledge

I got a messege that I was Charged Rs 20 for 20 days subscribtion of Hello Tune, but i can't understand how can it be possible without my knowledge. I have not put any request for activate Hello Tune. It is Very shameful for the service provider (AIRTEL) that putting charges to their customers without any means or request. This is not about a tiny Money but about Ethics.