IRS scam. the IRS does not call you.

called, left no message. i blocked it.

Wireless Caller, female voice saying the IRS is filing a lawsuit against me, but she did not identify herself as from the IRS. Sounds like an IRS "ambulance chaser".

Claiming to be IRS- Fraud Call

I called them back and they said I owed $50,000.  So I said ok, I'll give you my credit card number.  I gave them a phony credit card number and pin code that I made up.  Soon as they got the phony credit card number the phone call was dropped by them.