Very Bad service, they don't even care about this issue and how damaging it is for a ex client, this is why I moved from FNB, unacceptable Service

FNB has the worst service, I closed my FNB accounts about 3 or 4 years ago, never heard anything until about 2 months before the end of last year where they said that I was in arrears with FNB Connect, even though it was closed. That was sorted out. but then My transunion account or any other credit burros has this on any of my profiles that I am in arrears, so now I am blocked from everything, I can't even change my MTN Details as of this issue. I am not in arrears and Fnb has confirmed this. FNB has told me that they are working on solving this issue with trnasunion but its been nearly 1 or 2 months and nothing has happened, no one cares. I am very angry about this.