Report it to the FBI, give number and location for that number. They have received numerous calls regarding these scams. In 2011 I was able to speak to an actual FBI agent, it just so happened that they were looking for the people that had been calling me constantly, not only at home but at work also. Some how they have ways of finding out where you work and they will start calling there also.
This number called... no message left.
Recent problems with calls demanding credit card information in exchange for lower interest rate. It appears overseas crooks are using USA phone numbers to facilitate criminal activity.