I have had that experience with several companies and have found a phone call to be much more effective. For some reason, in some circumstances, e-mails don't always get through to who they need to, when phone calls will. I am not making excuses for Griffin - they certainly ought to answer their e-mails, but if it's important and your not getting a response, call them and let them know. For all we know there are a bunch of receptionists out there tossing e-mails in the recycle bin and nobody is aware of it!
I also have had an automated e-mail response from several companies that was never followed up. That's a dissapointment too. Cheers, Alec