I found that you can actually have items disputed by adding/removing statements on Experian Dispute Report.
I had two items that were verified by the creditors a while back and am unable to dispute without providing written statements and documents.
Today I tried adding a statement on one item and deleting a statement on another, now both items are being disputed.
and this has happened before and has worked on getting items deleted from your report.
http://ficoforums.myfico.com/t5/General-Credit-Topics/deleted-collection-acct-after-adding-consumer-...
Just thought i'd share this info to people having difficulty disputing on Experian report.