If these were really "promises", they'd be in writing, no? Why is this being handled in a blog post, and not in a lawsuit for breach of contract? Something seems to be rotten in Napa Valley...
Not everything needs to be a contract or a lawsuit. Sometimes it's fine to take a man at his word, and then simply tell him to walk away if his word is no good.
I was recently involved in a legal dispute where there was no written contract, but the trail of emails and communication was good enough to see judgement in our favor.
* Since I mentioned that IAAL above, this comment is not legal advice.