I blocked them after the above call, and yet they still call. Apparently their system does not respond to the official Beep beep beep, "This number is disconnected..." message.
WHOEVER THEY ARE THE DO NOT LEAVE A MESSAGE OR SAY WHAT THEY WANT! EVERYTIME I ANSWER THEY ME ON HOLD OR THE CALL GETS DISCONNECTED! IT IS VERY ANNOYING AND SOME PEOPLE DO HAVE TO WORK AND SLEEP TO GO TO WORK! HOW CAN I GET THIS TO STOP!!!!!!!
Try not answering any calls where you don't know the name or number! (Hopefully you have Caller ID.) And DON'T ever call a number back; just lets them know they have a "live" number. If they never get a response, they eventually give up.