LOL! I got the same exact thing. First call from this number, then the second call from 469-287-7833 one minute later... love the block caller feature on my phone, that's for sure. Buh-bye scammers.
Received message from 469-327-6040 saying IRS was filing lawsuit against me for unpaid taxes. An hour later 469-287-7833 said it was my final notice. IRS DOES NOT CALL ANYONE. As said before this is a SCAM