I too received same threatening automated phone call from 360-663-4438 claiming to from the IRS. We saw on the news that the IRS does NOT contact people by phone. SCAM!!!
Received a disturbing message claiming it was the IRS and they were issuing a lawsuit against me for fraud for tax years 2008-2012. Officer John Watson, case #DC 2579. They had my name and address. Said I owe $4682 that I could pay now over the phone or go to court and it would be another $10k-$20 to do this.
The call came from the United Kingdom. The guy had an Indian accent. They said I could not meet with an IRS agent directly. When I told them this sounded like a scam and I would call the IRS directly to confirm this, he became rude and hung up.