Left a voicemail warning me to call before they pass the criminal information they have on me to my local authorities so they can proceed with my arrest.  Kinda Strange to have the irs only call once leave a message and not ever send any type of physical letter and the female voice is like a computer robot type of siri thingy.

It's not only "kinda strange" - it's a scam.  You can read more at the link here (from the real IRS):

https://www.irs.gov/uac/Newsroom/IRS-Reiterat ... -Telephone-Scam

The two versions I've heard sound like text-to-speech system voices
.... which WOULD ex-plain .. THE clipped and ... halt-innnng speech PATterr-errn no ... HOO-man would use ... goodbye!

Only one human... William Shatner.

(spins on heels, palms up) But conSID-errr .... that even WITH ... his signature .. lonnng .. pauses .... Shatner's cadence aaaannd in-FLEC-tion conform to what is .... NOR-mal for a North American audience.

The great difference is that a human knows (usually) what he's saying next and originally modeled the speech patterns of his parents. Computers are too stupid to imitate us without a lot of programming help. An actor has a lot more to worry about at the point of dialogue delivery. Reportedly Shats won early praise on stage forrrr ... his pause habit ... buying him TIME toooo .... re-CALL ... his next line while ... EM-ulating unrehearsed speech.