Caller ID says "Cambridge  MA".  They leave no message.

I call back after hours (using *67 to block my number).  I hear the following "Thank you for calling the Donor Privacy Protection Line.  Our office hours are 8AM to 5PM monday through friday.  We are proud to partner with America's greatest non-profits in our telephone fundraising campaigns.  Some of our partner agencies support health, veterans, food bank, and other vital services for people in need across the country, and we're grateful for the chance to support their efforts.  If you no longer wish to receive calls on behalf of one of our non-profit partners, at the tone, please, state the phone number you wish to be removed from the call list and the name of the non-profit from whose list you would like to be removed.  We hope that you will continue to support the organization through other channels.  Thank you for calling.  If you would like to leave a message, I'll record it now.  <pause> Thank you.  Your message has been sent.  If you need further assistance, enter pound now.  Thank you and goodbye."

I can't say that I appreciate them spoofing the caller ID.