Claiming to be part of the justice department and that they are "investigating a crime." Asking for contact info including addresses and phone numbers. Sounds like a scamming idiot.
Just to let everyone know, this is DEFINITELY a SCAM. These people are NOT from the IRS or any other US Government entity. I have alerted one of my friends that is a senior FBI agent and an active case has already been started on them. If you ever get a call from some claiming to be from the IRS and as soon as you ask them a question they begin cursing you, IT'S A SCAM. Please call the real IRS, FBI, local police, etc. They are in violation of 18 USC 912 - impersonating a US official for the purpose of obtaining and item of value (ie money).
This is some coward hiding behind a magicJack device plugged in at some God-forsaken corner of the world where there is Internet service. He's no better than a common criminal using a magicJack device and your fear the same way a common thief uses a toy pistol hidden in the pocket of his overcoat to make a bulge that looks like a real gun.
You can verify that this is a magicJack number by searching for it at http://www.phonevalidator.com .
This scam has been extensively researched at
http://www.pindropsecurity.com/consumer-fraud ... irs-phone-scam/ and it was found that magicJack numbers are frequently used, and many of the scammers are operating out of India. There is even an audio recording of a call returned to one of these numbers and a written transcript of the recording contained in links from the Pindrop Security blog.
MagicJacks are readily obtainable outside of the United States for about $100 US and can come with up to a year of free calling to the U.S. and Canada. In India, see, for example,
http://magicjack.in .
In addition to the regular reporting channels, e.g., the Department of the Treasury, the FTC, and/or your local state attorney general's office, you might also report the abuse to YMAX Corp. I have seen reports that they are pretty good at responding to complaints and may be able to permanently shut off a magicJack device, if necessary, so that it can never be used again.
The YMAX Corp. main web page is at:
http://www.ymaxcorp.com
and their site giving information on how to lodge a complaint is at:
http://www.ymaxcorp.com/contact.html
Note that the "contact" website gives a clickable link to a "live chat" where you can make your complaint.