You can also try the following for West Asset Management:
Mailing Address (P.O. Box)
P.O. Box 2308
Sherman, Texas 75091-2308
Mailing Address (office)
2703 N. Highway 75
Sherman, Texas 75090
(877) 370-8739 Phone
(888) 662-7547 Phone
(903) 891-8040 FAX
(903) 891-1372 FAX
I culled all of this info from the various correspondence we had with them in the past month or so. My wife had an old medical bill which we paid in full, but it was still showing on the CR.
These folks were pretty easy to work with and FAXed and mailed us copies of a letter to use for disputing the entry on the CR.
Good luck,
FICOnater2007