We got a call from this number today pretending to be from an investigation unit for the state of California's income tax division. They told my husband that he owes back taxes and that they sent letters, but no response and that there will be a warrant out for his arrest and that the marshal will come. We called them back to ask them if they were legitimate and the guy kept hanging up. We called again and he said that they will show us how legitimate they are once the cops show up at our door. Totally insane!