Just a quick note. Went to the NCO Group home page. They have an online form to dispute letters. The only suggestion is where it says "have you disputed this with credit bureaus?"
Check YES, then in comments state that it hasn't appeared on your report yet and your intention is to be sure that it DOES NOT ever appear on your report as it is not a valid
debt.
State why you think it is an invalid debt; discharged, past
statute of limitations, etc.
Only downside (for me at least) is requirement to list phone number.
Not sure they have mine yet since it is unlisted and the letter was sent to my mother in VT. But I'm sure there's ways to get hold of unlisted numbers if they really want to.
Here's the URL
http://www.ncogroup.com/contact/debtor.aspx
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