Come on FNB - where is your service?

I have been trying to close my bank account for two weeks now. I cannot do it online. I went into a branch and the consultant tried helping me but she needed to close my overdraft balance which we couldn’t do in the branch. She said that she would follow up but she didn’t. I called FNB but just held on the line for ages. I tried closing it on the secure app but that didn’t work. I am trying again now and I just don’t understand why it’s taking so long. Money has been debited from my account now (debit orders that I tried cancelling) and I will be charged interest on that which is not acceptable. And now because this money has been debited I can’t request to close the account… And I will have to pay the banking fees for April which I don’t want to do. This is not ok. It seems that nobody is helping me.