Who called from 6469810271

Scam, generic recorded message that IRS has filed lawsuit against you. Leaves no company name and does not name whom they're calling

Got an automated call saying that the IRS wants to speak with me and to call back a specific phone number.

IRS scam-ignore it and do not call them back.
Report it: https://www.treasury.gov/tigta/contact_report_scam.shtml

Left message:
This is the IRS calling about a lawsuit against  you. Call back immediately and left the number. Didn't ask for anyone specific so they apparently are calling people at random.

Just got the call - recorded msg from the IRS it says.  Thank you all for writing in about it.  Clearly its a scam