Claims to be the IRS and tells you they are going to file a lawsuit against. This is total crap as the IRS wouldn't call you, they would just send certified mail informing you.

Appears to be a robo-dialer with the IRS.  I confirmed with the IRS, they never call.  They send letters.  Do not call.  They are committing a crime by impersonating a government official, but then again, they said IRS, not the Internal Revenue Service.

We have received FOUR threatening messages from this number.  It is a robo-dialer claiming to be with the IRS - they also specify "Internal Revenue Service" and state they are filing a lawsuit against us for unpaid taxes.  This is a SCAM.