Called last month and again this month looking for my mum who died a year ago.  Said she owed taxes and there was a warrant for her arrest.  Both times I called back and told them she had died and to remove her name / number from their list; I also told them I knew this was an attempt as a scam.  Today, they called, and I called back . The person who answered had a heavy accent (India?), and he refused to give his name.  He hung up on me.  I called back four times, each time asking for the name of the person who the arrest was for, and that was refused. This last time I called, the guy said just to not call back.  I also reported the phone number and gave info onoine at https://www.treasury.gov/tigta/contact_report_scam.shtml.