Refuse to refund my over-payment on my co-payment

I am extremely upset in the way the medi-clinic Louis Leipoldt handled my account. My husband has been admitted on 12 Aug and I had to make a co-payment of R5490. (R1830 for admission and R3660 for procedure). He was discharged on 21 Aug. My medical aid waivered part of the co-payment, the R3660. So I made an overpayment on my co-payment. Now I am struggling to get this back. The medical aid run was on 13 Sept, almost a week ago. They said they can't refund me until the money appear in their account, however they got the remittance on their screen which they sent me a screenshot. My husband has been admitted again on 30 Aug and I had to make another co-payment of R1830. This is a different admission. Now the hospital wants to wait until that account has been settled before I get my refund. How can you keep my money aside? Each and every account should be dealt with separately. When the admission of the one account is settled and there is an overpayment I should get my money back. Medi-clinic is just there for the money. They are not interested in dealing with you as a patient and with your welfare. They just want your money. I spoke to Ruth Booysen and Leonie Smit.