Poor and pathetic customer service ever

I HAVE BEEN A LOYAL FNB CLIENT SINCE 2006, I have/had a revolving credit facility with FNB, and the service I received with the premier banking staff was pathetic and unacceptable more especially from Roux Pretorius ("Credit Manager"), he is one of the insensitive and useless manager I have ever came across with in my life. I initially settled my revolving credit on 18 July 2018 and requested for my account to be closed and also requested a paid-up letter from FNB, and I was told by a banker that they will escalate my matter to the Roux to close off the account. I called premier banking team on 19 July to follow up on my query then I was told that the account will not be closed reason being that I need to pay an extra R334 that is still outstanding in order for my account to be closed I then paid the said amount on 19 July 2018 as requested to. I was then told that my account was fully settled and with a R0 balance on the account but will only be closed off on the 23 July 2018 because there is a credit that is due to me which must be addressed before closing off the account (I was not happy with the outcome as the credit referred to was the R335 that I was then being instructed to pay by FNB). I called FNB on 23 July 2018 to follow up and I was told that several emails have been sent to Roux (he is the only one with access to close off the account) to close off the account and unfortunately he cannot close off the account on the 23 July 2018 but will close it off on 24 July 2018. called on 24 July 2018 in the morning and I was told that Roux has not yet closed off my account and another reminder will be send to him to close off the account, yesterday at 10:24am I received a letter that my account was paid-up and closed. this morning on 25 July a debit order was run on my account and when I enquire with FNB premier team and I was told that my account is still active and hence the debit order and an email will be sent to Roux again to close off the account.

how many times should I keep on making payments to close off these account? what is it that I need to do in my side for these account to be closed off? I have never in my life receive this kind of service from FNB for 13 years, what happened to the efficiency and excellent service we are used to?