Credit record destroyers

Once you have a contract with cell C, they ruin your credit record. I paid the Last extra charge R70 which I don't understand where it's coming from in Sept 2022 but until today I haven't received a settlement letter and it still appear on my credit record as arrears. I dislike Cell C because of that, if they don't respond on the review. I might as well report them to trans union because I want them to disappear from my credit record which is affecting my scoring.