I could not disagree more with some of the "it won't do any good" sentiment in this thread.
ABSOLUTELY you should be writing and contacting the decision makers to let them know where you are at. Bad things happen when good people do nothing.
The most important thing is you be respectful and don't come off as a raving lunatic. Tell them you demand excellence and how distressed you are. Also, believe me they know. There is NO way anybody in charge is happy with what's going on... 10,000 unsold seats means half mil lost revenue.
So, we need to validate their concerns by letting them know how we feel. Again be respectful and professional in your communications, and don't necessarily expect a response. Plus you will feel better knowing you did something proactive.
I will try to find the contact info.