can anything be done about this problem?

this is a fax number, on the fax that we received they gave us a phone number to call to remove us from their list, which is (416) 544-4317 however, the operator indicated that this phone number doesn't exist, so there is no way to stop themand i am on the DO NOT CALL LISTwhat they are doing is totally unethical

beep beep beep

~6 PM MST...I just got called by a live person, woman, and she tried to hesitate but was too calm to appear surprised and indicated she was calling for my voicemail. [good grief, get real lady] I told her that she needed to call the voicemail back. [click!] Apparently, she was trying to confirm name with telephone number or ?  I didn't confirm or deny I was who she was calling for.  I have been expecting some kind of call attack since...but nothing yet.  The day isn't over, yet.

This number have been calling us every day except weekends for over a month
the few times i've anwered without checking the number first the line was open but no one would say anything.  Just weird.  They call everyday and hang up just before the call gets to the machine.

Someone from this number called and I answered.  They asked for my voice mail and when I said they were speaking directly too me they hung up. When I called the number back a message says the number is not in service.