Subscription to AirG Social Service

For the last few month i've been getting this sms:<br> <br> Your recurring R7.00 Subscription to AirG Social Service will be billed on 2015-05-24. To unsubscribe click [URL Removed] :)<br> <br> I don't know how to cancel it. I have clicked on a link that takes me to the [URL Removed] site, I don't even know where to begin to look for this AirG nonsense.<br> <br> How can i get rid of this \subscription"that is taking airtime regularly for a service that comes from god knows where??<br> <br> <br> """