Discovery Bank unable to provide adequate service.

Discovery Health deducted an amount from my Discovery Credit Card for blood tests and the service provider is still asking me for payment. I called Discovery Bank and the agent told me she would send me proof of payment for the transaction that I could then send the service provider. I have not received that proof of payment. I want to close my Discovery Bank accounts. I requested cancellation and closure of my account as well as transfer of my funds to my FNB account last week and am still waiting for a reply. I don't see why I have to follow up after Discovery due to their inability to get their systems working properly. I assigned one start because there is no ability to assign zero stars.