Finchoice refuses to fix their mistake done on customer account

I have 2 accounts with Finchoice and 1 of the accounts fell into arrears. I called Finchoice and asked them to do debit my bank account for the amount that was in arrears. They did the debit but then went and credited the wrong account and the account that they were supposed to credit remains in arrears to date. I have made several calls for them to transfer the amount to the correct account because this is affecting my credit record but to-date they have not done it. Every time I call the call centre and speak to an agent they log a request and I get a reference number, after a day or two I get an SMS to say reference has been resolved when it's not. I've asked to speak to a manager and everytime I get told a manager will call me back because the agents are working from home but no one has called me back. It has been such a frustrating experience and they have not been helpful at all. Their call centre has no structure whatsoever so when it comes to customer complaints no one wants to take accountability in trying to resolve client query. I mean this is a mistake done on their side by one of their collections agents but they are not even willing to fix it. At this point I would honestly advise anyone who's thinking of taking credit from them not too because they will get ****ty service. They don't care about customer service and their collections agents are very ***********.