robo call saying, "Before we send we bill as a legal manner and send this case to the local courthouse, please call us back 425-298-9548." I did actually try to call them out of curiosity and their voice mail box is full and can't take anymore messages.
I received a similar call. When I called back a recorded announcement said that it was the Criminal Investigation Division of the IRS, when a representative answered I told him about the message I had received. He asked for my name and I hesitated because I could hear background noise similar to a call center. I told him that I did not believe that he was a representative of the IRS and he hung up.