Same here. Just got 2 calls yesterday from this number 201-669-3564. It was a hard to understand recorded message that said "legal action against you, call IRS". No return phone number. It seemed like a scam. Glad I found this website.
Telling me that something was wrong with my identity and the IRS.
When I would not give information, told me they would file claim and I would get something in the mail after lawsuit was filed.