I live in New York state and so called the State Attorney General's office to report these calls and to put a stop to them.  They took a complaint but also gave me the web address for the Montana Dept of Justice and their phone number.  I called them and they said the companies making these scam calls are from California and have phone equipment to scramble where the phone call is actually being made from.  The Montana DOJ then gave me a phone number for the FTC to call and file a complaint.  Their number is 877-382-4357.  I filed a complaint with them.  The woman said the best thing to do is NOT TO ANSWER THESE CALLS no matter how annoying they may be.  It is hard to find them to prosecute and there is not much more you can do.  These scams call you no matter how good or bad your credit is.  My credit rating is 810 and I have no debt to speak off.  They call you from some phone list they got, and you just have to hope they get tired of calling you.  This happened to me several months ago and it lasted for two months.  It stopped but now has started up again.  I would like to have them all arrested, put in jail, and throw away the key.  They are the scum of the earth and should wind up in hell