Vodacom Random Billing by Content Publishers

I am a Vodacom contract user and am very appalled that Vodacom allows random content publisher's to add charges to my monthly bill. The funny thing is If I try to top up airtime via my App it tells me I've reached my monthly credit limit but only after that they allow random content publishers to bill my account. I'm very annoyed as this is obviously a plot between Vodacom and the random content publishers to ***** money from their customers by billing them with no controls whatsoever on the verification of the subscriptions. All content subscriptions must be billed via Credit\Debit Cards as children can be playing with my phone and sign up to content subscriptions without my knowledge. This give me an opportunity to reject the payment not just to wake up and see new charges on my bill. This is abuse by Vodacom to add these charges to my monthly bill. It is unacceptable.