Received 3 phone calls in a row (I was on a work call and didn't answer) and a VM saying I was involved in a legal dispute. I think she said her name was Agent Jennifer Lincoln but couldn't really understand her. She got my last name completely wrong!

i received a call from a some guy, could not even understand half of what he was saying. except for me to get a lawyer because of legal matters that had been brought against me. he left that on my voicemail, when i called back all i got was a busy signal.

At least twice a week.Common scam and gets more intense the closer we are to April 15 in the US.  Ignore and block the calls.

Total scam.  Originates in either India or Pakistan.   Block and ignore.   DO NOT RETURN THE CALL!
See:  http://www.irs.gov/uac/Newsroom/IRS-Reiterate ... -Telephone-Scam

Report them:
https://www.treasury.gov/tigta/contact_report_scam.shtml
I’m an Enrolled Agent with the IRS (Inactive). IRS does not initiate contacts by phone.  US mail only.   IRS does not file lawsuits.  IRS has enough administrative authority under the IRS Code and related regulations to collect all taxes lawfully due the federal government.     Court action, if any is handled by the DOJ and all parties are entitled to legal assistance if it is a criminal matter.  But--tax disputes are for the most part civil matters.  90% of all IRS tax disputes are settled administratively.  IRS has absolutely no authority to call on local law enforcement for anything. Local law is never involved in IRS tax disputes. IRS does not threaten to involve local law enforcement or to arrest you for nonpayment of federal taxes.  IRS has no powers of arrest as related to ordinary tax disputes.  Having a deficiency in taxes owed by way of audit is NOT a crime.  IRS does not cold call anyone and demand immediate payment of  money.  IRS does not ask for financial information over the phone.   IRS does not accept Green card money paks for payment in any case.  No one is prosecuted for ordinary tax disputes. IRS has absolutely no authority over anyone's professional license. Professional licensing is handled by state governments.  Yes, levies on property to satisfy an existing tax obligation do occur, but only after a very long period of negotiation. And yes, liens are placed on individuals but  usually after a lot of negotiation and a failure to reach a settlement.    All determinations of tax liability are subject to appeals.  All  contacts by the IRS are initiated by US mail.
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There are no supervisors.  Usually just twenty or so callers, and IT person and the owner/operator.  They are all in the same stewpot together.