They have threatened to have me arrested by law endorsement officers if I do not comply and call them back right away for more details. They are demanding a cash payment to avoid this action by using a pre-paid debit card in the hundreds OR thousands of dollars. The TWO phone numbers that they have used so far are (509) 872-5245 and (360) 362-4512
Official IRS Government site detailing this scam and providing links to report it:
http://www.irs.gov/uac/Newsroom/IRS-Warns-of-Pervasive-Telephone-Scam