Can't close my account?!

I opened the bank account in 2021 for my small business. After leaving SA for a year, I did not think to close the account because there are no monthly fees. But then when I came back my account has gone into the negative because of an inactive account fee that they charge. I made the balance positive again but now I cannot close my bank account. I have tried calling customer service 3 times but no answer and the only in store branch also can't help.