Estimate Electricity Billing on Prepaid Account

After having a faulty meter for over a year (being billed estimates monthly) and not repairing the actual meter, we installed a prepaid electricity meter in August. Since August we have been buying electricity for the meter but Johannesburg Metro still bills us monthly estimate account for electricity too. I am receiving these incorrect bills and also threatening sms daily. I have been to the Roodepoort offices various times and have spoken to the call centre almost daily since then. They keep telling me to be patient they are still busy with my query. They also told me that my electricity would not be cut. Yet on Friday 27 November they did cut my electricity. When I went to the offices on Friday they where \off line"and could not help me. I have been without electricity the whole weekend and this morning I went there again"