Has happened multiple times

I WAS AWAKENED BY A CALL FROM THIS NUMBER AT 6:15 A.M. ... WHEN I TRIED TO ANSWER, NO ONE WAS THERE. I TRIED CALLING BACK AND GOT A BUSY SIGNAL FOR OVER AN HOUR. WHAT HAPPENED TO THE "DO NOT CAL"PROGRAM". I CONSTANTLY RECEIVE TELEMARKETING PHONE CALLS ... AM 79 YEARS OLD, IN POOR HEALTH AND THIS IS A TERRIBLE INCONVENIENCE. WHAT CAN YOU DO ABOUT IT!

Unknown fax number...dialing several times per day and well into late night and early morning