Initial call came in but I couldn't get to it in time. No Message left on vmail. Did callback using call ID and person answering gave a name and and ID# and identified himself as working for the IRS Tax Investigation Unit. I confirmed with him that he did, in fact, work for the IRS and he replied in the affirmative. When I asked what the problem was he avoided the question. When I observed that I would have expected to have received written notice from the IRS before any other contact he said next time I would be and hung up. Caller had a rather thick sub-continent accent - India or Pakistan country or residence or origin. Reverse lookup indicated DC area mobile #. The IRS website contains the following information:
An aggressive and sophisticated phone scam targeting taxpayers, including recent immigrants, has been making the rounds throughout the country. Callers claim to be employees of the IRS, but are not. These con artists can sound convincing when they call. They use fake names and bogus IRS identification badge numbers. They may know a lot about their targets, and they usually alter the caller ID to make it look like the IRS is calling.
Victims are told they owe money to the IRS and it must be paid promptly through a pre-loaded debit card or wire transfer. If the victim refuses to cooperate, they are then threatened with arrest, deportation or suspension of a business or driver’s license. In many cases, the caller becomes hostile and insulting.
Or, victims may be told they have a refund due to try to trick them into sharing private information.
If the phone isn't answered, the scammers often leave an “urgent” callback request.
Note that the IRS will never: 1) call to demand immediate payment, nor will the agency call about taxes owed without first having mailed you a bill; 2) demand that you pay taxes without giving you the opportunity to question or appeal the amount they say you owe; 3) require you to use a specific payment method for your taxes, such as a prepaid debit card; 4) ask for credit or debit card numbers over the phone; or 5) threaten to bring in local police or other law-enforcement groups to have you arrested for not paying.