Incorrect Billing of account

I was billed for 5GIG of data and was told by a consultant that it was a mistake on Telkom's side and will be rectified as soon as possible. After 2 weeks of calls I was told that the case is still open and the specific department dealing with this issue can't be reached telephonically and only by logging a query.<br> <br> I am now billed R400 more than what my subscription is for this month. Never have I experienced such poor service form a mobile operator and regret that I took a contract out with Telkom.<br> <br> Please help!!