Paid up account reflecting as unpaid for over a ye

I was in arrears on my credit card and it was handed over. I settled with the attorneys/debt collector a long time ago. Experian reflects the account for the full amount is still in arrears. I phoned the collections department and was put on hold for 15 minutes. Eventually I terminated the call. This is not the first time I have experienced this issue. It is shameful that I have to resort to hellopeter to get a response!