I've also called the number provided to remove my fax number from the list of those being harrassed. Listed email address for the company, zchost.net, where the faxes are originating from are:
[email protected] and
[email protected].
If you continue to be harassed, I suggest filing an official complaint with the Better Business Bureau:
http://www.thebbb.ca/commoncomplaint.html?step=1
...I have chosen to call the company who is employing this marketing firm to ask for a competitors contact information, explicitly citing my preference as a consumer to deal with companies who employ 3rd party companies who adhere to provincial/federal legislation and best practices.