Vodafone Live Charges

I have been a prepaid customer for some time and recently been aware that my airtime is just disappearing without making calls. So I kept log of my last prepaid loaded airtime and for a R100 got to talk for 3 min and 25 seconds. So off to Vodacom to be told I subscribed for games via Vodafone Live... really? I am 49 years old and have better things to do with my time. And before you suggest my kids.. well they are out of the house . I have been reading some comments regarding this issue and I agree, Vodacom has just found alternative ways to boost their revenue stream. If it is so easy to subscribe, why is it so difficult to unsubscribe????