Calls at random hours. Leaves a robotic voicemail "The Reason for this call is because the IRS is filing a lawsuit against you, to get more information on this case file please call our department number 660-787-0112..."
I received a call from this number and I called it back. The male who answered the phone on the other end said that this was the IRS but he wouldn't tell me what the call was about unless I gave him my phone number. When I refused to give it to him, he hung up.