Worst Service there is

They made a mistake by billing me R4600, back and forth with them for whole two months. Dispute was made and I was cleared of it. Now problem is the ridiculous amount is on my score, it literally took them minutes to put it out there now they when they have to remove that they giving me all sorts of ridiculous answers. I'm stuck, I cannot do what I need to do because of that amount hanging on my score. They said it would take 48hours to clear up even now. Their mistake is affecting me in all sorts of ways, it's so frustrating.