failure to close accounts

Last year May I paid up my Credit card and requested that they close it, I got a letter stating the account will be closed on the 12th of June 2023, this year around June I followed up with wanting to close the bank account, I was told I cant close the account as I have an active credit card with oustanding fees. I asked how as it was paid up and closed, the consultant said they have to refer the matter to their vietnam team, I have been following up on all know channels, the credit card and bank account are still open to this day without reason of why a year later when I have insisted on closing them