I sent a dispute letter to all 3 credit bureau's. I received receipts back from Transunion and Equifax within a week. Experian, hasn't sent a receipt, they should have received my letter first.
The address I found on here, I used...
701 Experian Parkway
PO BOX 2002 Allen TX 75013
DONT USE IT
Use....
Experian
ATTN: NCAC
PO BOX 9530
Allen, TX 75013
(found the addy on my credit report)