Disgusting service and ridiculous Data services

Vodacom has a terrible customer service on all levels. Something has happened with my data usage and the only response it was accurate - When I called in to query the response I got, I got met with a service agent who only came back with feedback of the same, now when I say I am not happy, I have attitude back from the service agent. I am put on hold for long periods of time. We pay so much for data and then still get charged up and above that and they will do nothing to investigate my query. This Mandelama should not be in customer service and Vodacom needs to be brought to book on their service and general attitude - Otherwise rather let me out of my contract as you are not providing me with the services you have promised.