Why Does Vodacom Enable Subscription ****s?

How does Vodacom charge a person for subscriptions he/she is unaware off with no notification. About a year ago, I noticed my airtime kept vanishing and Vodacom Customer Care told me that I had subscribed to sites I have never heard of. I cancelled the subscription but the agent said that Vodacom cannot stop any possible future subscriptions from coming through and I will NOT be notified if it happens again so off course this happened to me again. I put in airtime and data last night and I woke up this morning with no data and airtime on my phone. The customer care agent told me that my data went away because I left the settings on. I know I could not have used that much data in my sleep. Regarding the airtime she told me that I have a R20 and R5 monthly subscription to sites and there's nothing she can do stop it from happening again. She even goes so far as to say it's not Vodacom faults and the RICA people might be selling my info. I frankly think it doesn't matter who has access to my info, its Vodacom's job to protect their customers from shady activities. I'm beginning to wonder what percentage Vodacom gets when subscriptions' are made.