Unauthorised Billing MTN Account (Subscriptions)

Today, I was shocked to discover that my MTN *** has been billed with various subscriptions daily for amounts such a R7 per day. This has been happening for almost a year as my bill has been sky rocketing to amounts of R1800 /month for the last year which is a lot for me!! I demand an explanation regarding how this is possible? Where do these subscriptions receive authorization to bill my account? This is ******* and happening to many unsuspecting consumers I am sure. I demand a statement and full refund. I will take this matter further fi need be as this is clearly a breach of the law. How can MTN charge me for services I have not agreed to? I want an explanation. I want a full statement and I want a refund. I am utterly appealed at the deceit and ruthlessness of the leaders in at MTN? ? ? How the hell is this allowed ?? Answers from the head this division is needed and I look forward to the response