Credit Report

I paid my $114.00 collection bill from Afni, Inc. in 2006.  It is still marked as delinquent on my credit report, but closed.  I have called, written letters and e-mailed the company several times to resolve the issue, but have received no satisfaction.  This is effing my credit all up, and shows up consistanlty as a red flag to anyone I attempt to do business with.  Fix this crap!