This caller left a voice mail saying that the IRS was suing me. 'Final Notice'. Also first notice. I hope no one accidentally falls for their ploy!

yup. same: mechanical recording saying IRS is filing suit if I don't call them back. If you're going to try this scam: use a real person not Mz ElectronicVoice; try using the correct verb tense; learn to use the appropriate American prepositions. Lastly, better send a letter first BECAUSE THE IRS DOESN'T CALL. They write! LOL

Same message about the IRS threatening a lawsuit for back taxes.  For me, those letters and calls are going straight to my accountants and attorney, and not me directly.  Tried calling back, but the phone kept ringing for 5 minutes.