Today (August.22.2017) I received this robocall:
"Hello. This is officer Lisa Williams of the IRS. A lawsuit has been filed on your name. Please contact our office before we send your lawsuit to court. Our phone number is 775-419-0874."
I also received FOUR robocalls of the same nature from 702-874-3575 yesterday August.21.2017.
I have reported both phone numbers to the FTC. I've blocked them from my cellphone/device. I have signed up for Scam Block and Scam ID with my T-Mobile plan, however it doesn't appear that these numbers have been logged as scam as of yet. As of this moment, the call will automatically reject, but my voice mail might still receive the message.
If you want to file your own complaint, you can do so here: