is that the site saying that, or an email? I've not seen that before. I assume you have "reset" the license on both his & your accounts. if not try that.
also you may need to try and put your account on another phone (not sure if you BB will run navizon, but there are BB versions.) with another "liscense reset".
other than that, you'll probably have to contact navizon's support.
http://www.navizon.com/phpbb2/index.php
they usually respond within a few days. (I noticed a spammer was having fun the last few days, and they havn't cleared them out yet. Just a warning....)