I DID NOT SUBSCRIBE FOR AIR G

I just received a sms from vodacom as follow: Your recurring R7.00 Subscription to AirG Social Service will be billed on 2015-04-10. To unsubscribe click [URL Removed] :) I did not subscribe for this!!!! And I want to be unsubscribed IMMEDIATELY when I click on the link it only takes you to vodacom site! Also I want to change the number on my vodacom acc but there operators are pathetic and hang up on you! They are welcome to check my cell nr and they will see that this is true!