Reported it was an IRS number

A poorly  recorded message saying the IRS has filed a lawsuit against me.  It very harassing. I get these calls from different numbers 3 times a day. My thought is it may be someone harassing me and others by using a computer app that gives Internet phone access and you get a dif number whenever.
The IRS sends you mail. Lots of mail. If you ignore them they take money from your bank account or keep your paycheck. Never will you receive a call until you call them. Especially a recorded voice that doesn't even use your name or give a ref number.

Who did you report it to.  I was instructed to report it to the FTC. just curious. I want to report all the numbers.

This number is a scam leaving messages (many) saying the IRS is filing a law suit against me.

This message left on answering machine also said the IRS has filed a lawsuit against me. Stated that I must immediately call the number back.