Accounts department does not know how to close accounts

I really wish I didn’t have to put the bank on Hello Peter but I really don’t have the time or patience. I have settled the outstanding amount on my credit card and sent the closure forms in on the 1st of March 2022. The gentleman on the line told me it would take 3-5 business days to close. Apparently it’s going to take 3-5 business months. I did all I was supposed to from my side and this morning , FNB has the audacity to tell me they have not received a payment from me. If you had closed the damn credit card in the first place- there would be no payments due. Not to mention how easy it is to open and account with FNB but how long and painful it is to close an account with FNB. I have tried 3 times to close my current account and es h time FNB has some sort of problem. Please can someone who knows how to close accounts contact me, so I can close and walk away.