These callers are claiming to be from IRS. It is a scam but the number should be shut down to avoid them from contacting people & wasting time & money.
Received a robo message stating that there was a tax issue and they needed me to call within 24 hours to avoid being arrested. I called them back just for fun. Let them talk for a while and finally told them I worked for the IRS. They took exception to my response and started spewing vulgar comments. I told them that was very unprofessional for an IRS agent and disconnected the call.