Female called left 6 messages 6 days in a row stating she was a representative of IRS and they had
filed a law suit against me and I needed to phone them immediately.

This a scam  this not the IRS they called saying the same thing they even acted like they where a cop telling me I was going to jail in 2 hour if I didn't pay them they had a fake case number and fake badge number. They will try to scare people into paying the IRS does not call no 1 this calls are coming from a dicentra country and they useing a spoof number . Report these calls so others do not get scammed  it is a shame how desperate these scammers are use common sense and never give them no information no matter. They tell you.