....another scam - if you were in trouble, you'd receive MAIL via USPS certfied or registered mail, or a process server would show up.  Real process servers do not call you ahead of time, nor do lawyers call you if you're going to be sued - they just file a lawsuit.

http://800notes.com/forum/ta-86217073a9c8dad/ ... 077595690349410
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http://www.consumer.ftc.gov/articles/0258-fake-debt-collectors
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http://www.deadiversion.usdoj.gov/pubs/pressreleases/extortion_scam.htm
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Also read up on the laws and your rights:

Harassing calls from a debt collector? Here is what you need to know
http://800notes.com/arts/Jb8EW-eDhQA/harassin ... ou-need-to-know

http://www.ftc.gov/os/statutes/fdcpajump.shtm

CFPB Q&A on debt collection practices
http://www.consumerfinance.gov/askcfpb/search ... debt-collection

http://www.consumer.ftc.gov/articles/pdf-0096-fair-credit-reporting-act.pdf
http://www.consumer.ftc.gov/articles/0149-debt-collection
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Follow the steps in what you need to know. A legitimate debt collector agency should not have a problem with giving you a real business name and address you can google and verify via google street view, BBB etc.
For extortion Scam Operations, file reports with the FBI, your state attorney general and Department Of Justice,FTC & FCC..

http://www.nw3c.org/
http://www.ic3.gov/default.aspx
http://www.fbi.gov/
https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
http://www.consumerfinance.gov/complaint/

And folks should consider looking at maybe getting call blocking device or phone....you can Google them and many are around $60 or so.