You did the opposite. Before trusting your bitcoins to any exchanger, you need to initially check all information and reviews, contact technical support. After all, all exchanges are made manually? What could have happened to your mail? Why did the exchanger demand your documents because of her? As far as I know, today many exchangers may require you to go through KYS if the amount exceeds $1000.
How come almost a lot of exchanges have this kind of problem, this should have been solved the moment that someone suffers from it because it really is detrimental to their customer base. To OP, you should pursue legal action that you plan to do because this kind of thing is going to happen again when no authority is getting involved and these services aren't going to improve if there is no fear of legal action towards them.