I have asked them to stop calling and they continue to call.  How do I make this stop?!?!?!!!!

Answering machine picked up; caller hung up without leaving message.  This number has been calling, early evenings, for many months now, but has never left a message.

Phone Number Report: CALLED TO TELL ME THEY HAVE TRIED NUMEROUS TIMES TO GET IN TOUCH WITH ME TO LET ME KNOW THAT MY LOW INTEREST RATE IS READY TO GO UP IF I DON,T TALK TO THEM. PUSH ONE TO TALK TO RECEPTIONIST OR TWO TO BE REMOVED. I PUSHED TWO AND THEY CALLED BACK AGAIN IN THREE MINUETS. THIS TIME I PUSHED ONE AND A WOMAN (AMERICAN !) ANSWERED. IREQUESTED TO NOT CALL BUT SHE HUNG UP AS SOON AS SHE GOT THE JIST OF OUR DISCUSSION. OBVIOUSLY WHEN I TRIED TO CALL THE NUMBER BACK, THE NUMBER WAS NO GOOD.