HF can determine whatever exchange rate they want. There's no way you'll win in court unless they promised you, specifically, full BTC refunds.
I don't think you're right, but these losers aren't going to sue, anyway.* Nor are they going to work together. They're just gonna bitch and moan while they get reamed up the @ss by Eduardo and company.
* Except Cedivad.
How many of the batch 1 customers have appeared here? A few dozens?
I think many are watching, and waitinf for the situation to unfold.
I think it's premature to determine how much of them will take up arms, based solely of the traffic in this thread.
For example, I don't intend to stand aside (or bend over), but I did not comment until now.
(If my intuition is right, HF is trying to measure the ratio of "problematic" customers just now, and that is one of the reasons behind their latest mail.)