Called my cell phone multiple times. Returned call, and was told he was an agent of US Treasury-IRS. Asked his name and badge number. He gave me 4 badge numbers, I asked him where the missing number was, as it should be 5. He then readily admitted to being a scam artist. We proceeded to discuss his daily decision to hurt innocent people and the price that he will ultimately pay, in depth, for the remaining 30 minutes.
Same as above posters. Threatened that they were going to file an IRS lawsuit; and must return their call to stop prosecution. A "bionic" woman's voice. Total crap. Scam for sure. IRS would send a letter first! :) I get these calls on a regular basis.