I received a voicemail today from the same number saying that they are calling from the IRS and there is an arrest warrant for me, so I need to call them immediately.
Got 10 calls today. When I called back for some fun, I was told I would have to wait until tomorrow because the "IRS" was shutting down for the day. 2 minutes later a woman called and kept repeating "hello" for 10 times. I ask her who she was with, she said she was with isis. I laughed and ask her to repeat herself. She repeated it.
Just got another call. Guess I ticked 'em off by calling their bluff. Dude told me "FU B*TCH. Now they have changed numbers and have left 5 heavy breathing voice mails.