I guess the scammers are changing number. Caller ID: Tx San Antonio
Robo call: the IRS has been trying to contact you......

Just got a recorded Message that IRS was trying to get a hold of me. Funny that they never called before.It said final notice. Beware of this number and don't pick up. Good Luck.

Received an automated call from this number saying that the IRS is filing a law suit against me.  The IRS only contact you via U.S. mail.  Scam!

Twice in the last hour, they left recording both times. Now on the blocked list....IRS Scam, reported to https://www.treasury.gov/tigta/contact_report_scam.shtml

Robo call with same pattern as described by BD.  I used the link above (thanks, BD!) and also reported them.