Calls over and over at least twice daily - leaves no message on answerng machine.  Same number for months now!
How can I cease the calls!!?

There's no way to prevent the calls from being initiated.  However you can protect yourself to an extent by using a call blocker.  Also, do not pick up on call numbers you do not recognize.

Calls multiple times a day, leaves no message if answerer is on-  lets it ring forever when its not. Really wish the phone co would make it easy for the home owner to block these calls