Recorded message. Ominous tone with mentions of dire legal action pending. To forestall magistrate or other call us. If you do not cooperate with us we cannot help you. Call Back the listed number, repeated.

Foreign accent: Stated calling due to an enforced action executed by the U.S. Treasury. Ignoring this will be an intentional second attempt to avoid an initial appearance in front of a magistrate or grand jury regarding a criminal offense. If you do not cooperate there will be serious actions against you. Call the above number. It repeated 3 times.

Got exact same message and triple repeat as Tracy above.  On my recorder on 3/17 and 3/18 while out of town.