PATHETIC Service

I have been on the Vodacom contract for more then five years. In all that time my account has never even came to near R500. I get an account for the 7 August for R5393. Then I phone Vodacom to confirm. Then they tell me I'm subscribing to sites I never head of. It's really strange that historically I never had a bill of this great amount and suddenly I get it and Vodacom does not even think this is not correct. Also from the 21st of August they have been investigating. I have called them numerous times. All they do is put things I don't know about what on the system each time. There is absolutely no sense of urgency.