Unauthorized content subscription

VodaCom indiscriminately subscribed me to a content subscription without my knowledge and deducted my airtime for this past month. I had stopped all content subscriptions since inception of my prepaid simcard. But I don't know how VodaCom subscribed me with my approval. I want my refund of airtime taken by VodaCom Charge Games. I laid a formal complaint yesterday when I spoke to Kelebogile to permanently block any content subscription and only when I call VodaCom Customer Care to unblock should there be subscription in this SimCard. I requested her to provide reference for future claim of my airtime consumed by this game subscription for this whole period as I have never used these VodaCom games and never authorized this subscription