POOR SERVICE

I received an invoice in August saying I must pay R87.00 which I paid. In September 30th I received an invoice to pay R2512.00 and on the 1st October I called in to dispute the invoice. The lady did not know what was going on she said the reading was the same as June which I found to false because in June I paid too much because of the incompetence. I sent an email on the 1st October and I was promised that they will into this matter. It took them 19days to get back to me with a lousy story that didnot make sense. So I told them I will pay half the amount as they told me they were investigating. I paid R1250. They came back to me telling me their system had a problem hence I paid R87 in August. And I told them this was not my problem and I will not be charged any penalties for this. Today October 27th, they sent me a letter saying I must pay the outstanding amount in 2 days if not a penalty fee of R500 and something would be charged and my electricity would be disconnected. I told them this in all the emails I sent them that I will not be penalized for their error that they didn't even advised me and apologized for. From April I have been paying exubent amounts for electricity and when I call nobody knows nothing but send threatening letter to DISCONNECT my electricity and tell the amount to pay yo have it connected again. This has been a very painful hassle. Now they want me to pay in 2 days, let alone the fact that they have not even sent the current invoice and today is the 27th October. I am threatened that I will be charged the penalty fee...why? What happened was not my problem at all. I can not be penalized for that and be threatened that my electricity would be disconnected.