I DON'T WANT WASP BILLING

Today, without my approval, or involvement I was subscribed to 3 WASP services. The call centre has cancelled the billing but I would like to know how it is possible for someone to bill my account without my involvement. I would like to know how Vodacom can even allow this. I was under the impression that Vodacom had double opt-in? I would like to know why you don't allow WASP billing to be deactivated for an account. Surely this is a simple thing and would save your customers a lot of wasted time and energy unless Vodacom gains from this ************ practice? I want WASP billing to NEVER occur on my account. I'm pretty tech savvy and know what these ridiculous things cost and what a waste they are so why would I knowingly put myself through that?