Not paying hospital despite full authorisation

My got full approval from Discovery for a procedure at the Femina hospital on October. After the procedure, the anaesthetist and the doctor were paid but the hospital was not paid. We have phoned them several times and every time they say it is under review, but nothing happens.

Now the hospital is haunting me because they want their money from me despite the fact that we have written authorisation from Discovery for the total cost.

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