Content Service Subscription

I received an additional line item on my invoice "H6-4S0BM" for an item called Content Service Subscription for a service called Whatsmob. I have never subscribed to this and yet I have to pay for it.

The call center says they can't do anything about getting a refund for it but instead I should go chase after the company Whatsmob for my refund. I called the number ********** but there is no answer .

Vodacom also says that they cannot block any future subscriptions, so if this happens again then I will have to pay for something that I did not authorize.