I work for the federal government and the IRS building is adjacent to my building (separated by a fence and guards). I will assure you that my agency nor the IRS contacts individuals this way - we do everything in writing. We have to. I also got this bogus call from the "IRS" and blocked it. If anything, call the IRS call center and you'll be on hold forever. They don't make outgoing calls. It's tax season for crying out loud.
Caller: IRS