This is a scam. It has called my husbands cell phone twice today saying that they are the IRS and it is our "final notice". Don't do anything, hang up!!
The name that showed on our caller ID was "Cell Phone GA" and it was a automated voice telling us the same, "The IRS is filing a lawsuit against you, for more information on this case file"...blah, blah...blah. IGNORE and block if possible