subscribed to R5 a service without authorisation

I have received a text message stating i have successfully subscribed to a R5 a day service from <br> <br> [URL Removed]<br> <br> I did NOT authorise this and do not want this service. Authorisation has been obtained **********ly.<br> <br> Vodacom should not allow these companies to operate on their network this way.<br> <br> i do not want to call the help line number in the text message either as this is most likely a higher rate call number to trick me into spending more money. Its a joke they can still get away with this *******.<br> <br> Queue their automatic reply saying that I accepted their terms and conditions ... you are *******. You obtained authorisation **********ly. <br> <br> <br>