Shocking service from Eskom refunds - Ref number ***

Eskom owes me R11 000. I am at my wits end with them. I have had nothing but bad service from them. 3 months ago I went into the Rivonia branch, I had to take a half day as I knew it would take time. I filled in a refund form, took the form to the bank to be stamped as I had to verify that it was my account. I was told it would take 15 working days for the money to be paid to me. Almost 40 working days later I called them as the money hadn't been paid. According to client services they hadn't received any request and no forms had been filled in. I went back to the Rivonia branch and went straight to the lady who helped my originally. She remembered me, typed in my reference number and was surprised to see that she hadn't logged in the information. I then spent the next hour sifting through papers that were in piles on her floor, looking for my papers. She didn't have them, so I had to do EVERYTHING again, including going to get a stamp from the bank to verify my account. I did it again and was told it would take 15 working days before the money will be paid to me. Again it has not happened! I have called the call centre more than 10 times and every time they tell me that they can't call me back as they are not allowed to make outgoing calls. They also can't give me an answer. What is it that I must do to get the money which is owing to me?????????