Nedbank and telephone calls don't go together.

On the 12th of May 2022 I requested a settlement quotation on my personal loan account with Nedbank, which has been handed over to attorneys that I've been paying for years already after Nedbank increased the interest rate to 27% for WHO knows what reason. Anyway, the same day I received the settlement quote I paid the amount, sent proof of payment and a few weeks later received the paid up letter from Nedbank. Now, 4 months later Nedbank is saying I still owe an outstanding amount on that account. I've tried to contact them today, every time the person I am talking to cannot help me and forwards me to someone else, after more than an hour on the phone the call gets dropped, and both numbers someone gave me don't work. Nedbank can contact me back now, I'm done holding. I have my paid up letter from Nedbank, and my proof of payment, that account is no longer active, and I owe nothing.