Non-payment of refund

I sold my house in Johannesburg in May 2014 with transfer taking place 1 August 2014. I had to pay three months estimated electricity charges in advance in order to transfer the property. As a result there was an overpayment of R2,087. I have completed all the required documents to secure the refund as the account has now been closed however despite numerous calls I am unable to get Eskom to refund me the money they owe me. The complaint has been escalated many times but still receives no response. My latest Eskom reference number in connection with this complaint is ***.