Closing an account is hard work

I have had my Jet Account for a few years. In October 2019 I went to our local branch to close the account. I paid the balance owing and the teller informed me that their telephones are down, I must please phone the headoffice myself. The next day I did so and since the balance was paid they quickly helped me, or so I thought. I received a sms on the 15th of February saying that there is a balance outstanding. I phoned the same day and the gentleman that helped me said he can see the request to close the account was done in the beginning of October 2019. He informed me that the request was never processed, but he will put an query through to reverse the club fees that incurred after I requested for them to close my account. A week later I phoned again. The lady that answered said the request is still onthe system. I must be patient, they will sort it out. Today (16 March) I received another sms saying my account is in arrears. I phoned again and this lady says there is nothing on the system. I explained the whole thing again and she first said I never asked to close my account and then said an investigation will follow. How hard up is this business for money that they donot close an account and still charge club fees after the account waa requested to be closed?