Missed the call but suspicious

They claimed this call is a final notice, that the IRS is suing me. Telling me to call them back. Caller ID says it's a mobile number.

Call from IRS regarding money owed.

Called me 3 times yesterday. 2 went to voice message.  One I picked up and told the man  they were a scam, that the IRS doesn't call people.  Today called me 2 times and left 2 voice messages in a woman's voice saying again that the IRS was suing me in court.  Not only is it a scam, it is a stupid scam.

Not "the IRS." They say "calling from IRS Internal Revenue Services." Definitely not legit.