I just visited their site and it says 30 day money back guarantee which means you really have the "right" to get back your $$ if you are not satisfied with their product and if you just purchased their product (I mean, 30 days isn't lapsed yet)

Found this in their corporate site that might help:

Worldwide Offices

Canada
(Corporate Headquarters)
375 President Kennedy
Montreal, QC
H3A 1J5 Canada
+1 (866) 286-2636 - toll-free (North America)
+1 (514) 286-2636
+1 (514) 287-0967 (fax)

United States
580 California St., Suite 1600
San Francisco, CA
94104
+1 (866) 286-2636 - toll-free

Europe
St. Mary's Court
The Broadway
Amersham, Buckinghamshire
HP7 0UT England
+44 (0) 14 9458 2010
+44 (0) 14 9458 2020 (fax)

Australia
Level 57, MLC Centre
Martin Place
Sydney, NSW 2000
+(61) 02-0238-6152

http://www.zeroknowledge.com/en/company/contact.php