Billed for something not required

I have just received an SMS saying \Thanks for purchasing Sunday Times Plus Digital at R60.00. Get your freewelcome tone http.... \" <br> <br> Firstly I did not purchase anything from Sunday Times, and how can Vodacom allow a debit of R60.00 go off against my airtime without my consent. I regard this as outright theft.<br> <br> "