Credit Card closure madness!!!

I have had THE worst experience trying to close my credit card facility. It has now been over a week since my original request, and I still haven't received a final confirmation of the closure. My original request (***) was processed within few days, but an error was made on Discovery's part as they have processed my request incorrectly, closing the transaction account instead of the credit card as originally requested. Following up on the matter numerous times (***, ***, *** and a few more of which I don't have reference numbers), I was ensured that they have escalated the matter and that it has been marked as urgent since our current home loan application is pending the formal confirmation of the closure. It has now been a week with numerous calls since the second request, and I've only received a notice (01 Jul 2021 4:53 PM) that the account has been locked as it was about to be closed. This morning (02 Jul 2021 2:55 AM), I received another notification that I've missed a minimum payment due and should make a payment to avoid penalties, even though the credit card was paid in full when making the closure request.

This is absolutely unacceptable and, quite frankly, ridiculous!!! How is it even remotely possible that it should take this long to rectify an error made on Discovery's part? There is just no logic to it! I am saddened and heavily disappointed as a longstanding customer of Discovery and such a "prestine" blue-chip corporation.