Content Services Charges

I have just queried my last three invoices regarding charges for content services. I thought that negative marketing was ******* but even after previous complaints to Vodacom they still seem to want to bill me for content services every now and again. They say that I can stop these myself so clearly it is an issue but why should I have to waste my time cancelling or stopping something that i did not sign up for. Hopefully they will resolve it soon but if I had not checked they would be billing me for stuff I don't use. Poor Service.