AFNI -Verzion Bill

In Nov. 2009 I lost my job the company I worked for lost their grant money because they did not handled their funds appropriate and was shut down.I had to write letters to attain my unemployment through investigation I received my unemployment in Mar.2010 by that time Verizon sent my bill to collections AFNI,Inc I call told them what happen the original bill was 269. they ask could I send 213.59 top pay off the bill and that what I did 4/10.
I get my credit report 2012 and they have me down as serious delinquent and that the bill was a write off when I paid them the amount they requested to satisfy the bill. How do I get this taken off my credit report. even though all three scores are the seven hundreds I'm getting turned down for loans because of AFNI.