Unknown cost on Vodacom account

I noticed a cost for data calls on my data bundle wifi contract, this number cannot make calls. I queried it with Vodacom's accounts department and they indicated I was subscribed to Uchater, I never subscribed to this, the extra amount of R171 on my account relates to this. They were able to stop the subscription, but cannot tell me how it got on there, since I didn't subscribe to this and they cannot remove the charge of R171. All this sounds very ***** to me. I think I should take this up with the consumer commision, as to how subscriptions, which I never subscribed to ends up on my account and then vodacom charges me for it....