No Response from Medical Aid

I have had a very bad experience with the service department at Discovery. I was told to pay back monies that was sent to me for a doctors account that was incorrect however that money was already transferred to the doctor. There was another payment that had to come in for a different doctor and that money was taken because of the amount owing to the medical aid. I have been in contact with the medical aid since Oct and to date have not received any communication back. I called medical aid and was told that the doctor for the first money needs to send a report to explain the vessels that were stented. I obtained that report from the doctor and sent it personally to medical aid and since have not heard anything back from them. This is very poor service