I know for a fact the IRS does not call and computer voice generated Nancy does not instill confidence. I called the number that called me and it is dead on the other end.
I also received a call from Nancy saying that I owe over $2,000 based on an IRS audit. After she gave me my previous address and I said that I don't live there and the IRS should have my current address based on last year's filing she hung up. I'm glad to see this is fake. It had me worried for a minute although I knew I didn't defraud the IRS.