I have rarely received these calls, but now I've gotten three in the last three months. I let all three go to voicemail as I don't pick up unless I recognize the number. One from a "private investigator" telling me I need to lawyer up and call him back, else an arrest warrant would be issued for me. And two from the "CRA" saying there's an urgent matter to discuss and unless I call back an arrest warrant will be issued for me.
At this point I must have three arrest warrants out for me, but I'm a wily bugger. They'll never find me!