FNB refuses to close my business account and wants to keep charging

Fnb refuses to close my business account!!! I have been trying to close my fnb account since last month. When i called them in February they said i had to pay thr fees i didnt have at the time so i waited for monthend and i paid the fees after that i called again on the first of March to say please close my account the agent said the account will be closed in 24 hours and all the funds in the account will be transferred to my personal account. On the 5th i got an email stating that my account was in negative if i wanted to close the account i should deposit money into the account. Fnb is a ******* they want me to continue paying fees for an account i am no longer using. I just want to close the account please !!!!