I've never tried it (or needed to), but I've heard that if you post at the Jetbook forums
http://www.ectaco.com/forums/show/185.page there's an employee who monitors and responds very quickly to issues like this.
Here is the email address of the guy at the forums. He's an account executive, whatever that means, but he does seem to take an interest and respond, from what I can see on the forums:
Jerry@ectaco.com