It's a scam. And all their threats are false and illegal. ABC News just did a report on this particular scam. Here's the link to the report: http://abcnews.go.com/Business/story?id=5621205&page=1
See my message below for more details and how to report them to federal and state law enforcement.
i am still getting phone calls i dont even answer them or call them back anymore i have already filed a report with the local law enforcement office and the FBI and i usggest that anybody who gets a phone call from these people do the same the more reports they get maybe they will be able to capture these people.