CollectMed Fraudulent collection

I went to see a neurologist (Dr. Zanele Makasi) paid my account in full R2,300 and two weeks later these people started to harass me for additional R513. According to the Dr. Personal assistant he filled a form that Discovery sent them and the service cost R513. So R2,300 is not enough for Dr. Makasi and she thinks that for filling a form that I had never asked for she can charge additional R513 without even notifying me. CollectMed tried to take the funds from my medical savings illegally without my consent, they had faked the code of service so Discovery will pay them (no code for filling form) and I reported them and the practice to Discovery to the health council and the Ombud.