Bad service and *****ulent settlement agreements

So I had a credit card with Standard Bank and defaulted on payments. Then I got offered a settlement amount to pay it in 3 months , which I did and till today no paid up letter. They decided to hand me over despite the fact that I paid off every cent in line with our agreement. As I’m writing this messages and emails are being sent to external parties requesting payment. I called and wrote numerous emails and I was told to Wait till they respond to me. Two months later I’m still waiting