incorrectly accused of outstanding account.

I received a phone call from Ellisras/ Marapong Mediclinic, the lady Sarah informed me my Medical Aid did not settle our account from my sons admission on the 3 February 2015, for having his tonsils and adenoids removed. I told her I will come in and see her immediately, I phoned my medical aid and they emailed me proof all accounts have been settled. I took the documentation from my medical aid and the receipt of the co payment I made to the hospital where I spoke to Wendy. Here Wendy informed me it was not for the procedure mentioned but for a previous visit to the ER where my son had to receive stitches, again I informed her we settled the account via credit card before my son was released. Wendy then went back on record and found the payment that was made. Wendy then apologised. I just feel that a Hospital that has a Five Star Rating then falsely accuse customers of non payment is insulting how many people dont quary outstanding bills and just pay them blindly. Medi clinic is robbing people and we dont even know it.