They have also been calling my # many times a day - is there anything that we can do to stop this?

They have called me the last couple days, calling both my cell and my work number.  I got the same call from two other guys with accents last week and very american names.  This guy says he's name is Adam something.  Last week it was Roger Miller and Albert Johnson. They are ridiculous with their threats.  I called the police last week as well as put in a complaint to the Attorney general.  The guy took the police's number that called them and called me back using the police's number! They are crazy and I have feeling they are not even in the country!