Settlement Letter Standard Bank

Years ago I had a bluebean credit card and even settled my last balance of R700. The only mistake I made i never phoned in to closed the account. To my surprise I was handed over for all the admin fee. And this I found out later on. I phoned the company that I was handed over which is DMC to find out what my settlement amount Is, they told me R2000. I manage to pay the R2000 last year around June. Up to date standard bank and DMC is still making me wait for my settlement letter. When I phone the send me to DMC or DMC sends me back to Standard bank. I emailed standard bank to speed up the process up until now I'm still waiting on the settlement letter. Please advise