Slow turnaround/response on complaint resolution

I made use of the settlement link on the FNB online website to settle and close my Revolving Credit Loan RCP. The settlement amount was immediately deducted from my account, the system said then there was an error. This was on the 28 March 2020 the account continue to incur fees and an incorrect debit order. I've raised it with FNB by logging a complaint the issue is still not resolved.