Listed for a nil balance account

I was listed by a supplier for an account which I have already settled. Since february the credit provider has been sending information to Compuscan to update their database. Again on April 4th, 14th and 17th a request was sent to update there database. <br> <br> It came to a point were I had to challenge my credit report, as always I have to wait 20 business days for them to investigate, when a request has been sent numerous times. This has become a serious inconvinience.