Unauthorized Billing

I am so dissatisfied with Vodacom and the level of service given to their customers. I have been charged for items I have not agreed to, which has increased my invoice statement. When I contact the customer care/service desk none of the consultants are able to assist me to have the issue resolved. I am a pensioner and cannot afford the charges billed to my account, especially when done without my consent. This is against my customer right and I expect to be contacted to have this issue resolved. I will not be held liable for charges I did not authorize.