I'm going to mail in my dispute to TU. I've been disputing on-line, but I need to mail this one in. Which address have you mailed to? The Fullerton, CA one or the Chester, PA one? Which have you had better results with?
Did you know you can dispute online? It's instant (no waiting for snail-mail to get it there). It is much easier to do it online.
This one works for me, but I am in SoCal(not sure if that makes a difference). You can also fax to the Fullerton office at 714-447-6032.