Account closure dificulty

On 14 November I asked that my FNB accounts be closed. The agent provided a settlement amount that seemed incorrect so I paid a higher amount so that both my credit and main account should be in credit. The agent said I would be contacted by the bank. Nothing happened. Since then two months have passed with the monthly cost still going off my account. How do I get these charges reversed and the accounts finally closed. The life chat on your banking app is useless and a waste of resources.