I just received this same phone call a few hours ago. Its Saturday, Feb. 22. I tried calling back only to get a full voice box. Sounded sketchy - how many David Johnson's do I know who speak like a beat up asian boxer? I could barely understand the message. This scam just hit Arizona.
I received two messages from a computerized voice claiming that there is a discrepancy with my taxes and that I needed to call now under penalty of legal action. Obviously a scam I haven't done my taxes this year. 415-251-5496