Unauthorised WASP billing, again

Again, I have unauthorised WASP services on my account. A daily fee has gone off my account all month, I only realised today and unsubscribed by sending STOP ALL to 30333. I was told Vodacom have a double opt-in rule? I didn't even opt in once! This is maddening, Vodacom really need to protect their clients against unsolicited billing. This is the second time this has happened, and it's unacceptable.