Keep CALLING SAYS IRS Left message to call back

Keep leaving voice mail to call them back, even when I answer the phone.  Broken English voice says it is the IRS and asks for my info when I call them back.

pick up the call, Recording said to prevent IRS prosecution call back.. So out of my fun curiosity I decided to see who these lovely people trying to scam me were, called back (I made sure to block my ID on their caller ID)... it just rang and rang and rang.. then stopped and got busy tone... pretty sure its a scam...

I blocked my number and called this number back, first time it just rang and rang and then the fast busy signal, the second time someone with an accent answered and said something, I asked them where I was calling and he said Internal Revenue Service and then hung up on me!  TOTAL SCAM!!

This # had called 37 times in last 3 days. Caller
ID says unassigned with 360-208-0902 showing.
Federal & State Call Blockers are Useless ...