Ask a good friend who speaks English (as his or her native tongue) to call UE on your behalf on Tuesday.
Have your friend explain to the UE customer service person (there are only 2 or 3 of them and they quite friendly and helpful) that you're dissatisfied for a number of reasons with your UE11, and that, much to your regret, you've sent them a rather unkind email concerning the matter -- for which you would like to apologize, because it wasn't meant in a personal way.
Then have your friend explain your specific concerns as calmly and as rationally as possible. Having a list to work from would be helpful so that your friend will be sure that he explains all of the issues you've identified.
Then have your friend ask the customer service person what they would recommend as the best way forward, given that you're most concerned about a quality defect and you're concerned that one of the earpieces will break quite easily (since there appears to be a crack on the inside, perhaps caused by air bubbles or whatever).
Offer to send pics via email. Offer to send the package back for their inspection. Suggest that the only two courses of action that you think would be appropriate under the circumstances would be to return the UE11 for a full refund, or to return the UE11 and have them make a new pair for you at their cost. If they are interested in pursuing this option, offer to work with them in terms of describing as best you can where you are having fit issues, such that they will be able to make the appropriate adjustments.
If necessary, you should be willing to have another set of impressions done and sent to UE (because if the fit is as terribly off the mark as you've described, that suggests to me that your impressions were not done properly to begin with).
Chances are you won't get far if you get on the phone with them yourself and start crying bloody murder. No doubt, you have reasons to be upset and concerned about the situation, but don't take it as a given that they won't do anything to help you out -- it's in their best interest to make you a completely satisfied customer. Threatening UE about exposing their poor business practices on the internet probably won't work too well at this point either, especially given the fact that you've already played that card! It's kind of late for that threat, wouldn't you say?
