@OP. Before you even think of pursuing legal action, I'd advise you to clarify what exactly happened (I can't understand what happened from your first post) and then strengthen your case first with evidence. Lots of it. And if you're talking about getting others to come under a single complaint, you're talking about class action lawsuits. Now I do not know the law well enough but I am aware that Poloniex recently strengthened their Terms of Use to explicitly say that any user who signs up and uses their platform waives their right to such legal action. My strong suspicion is that Bittrex is no different. By signing up and using these exchanges, you probably signed off a lot of rights, if the ToS stands.
I'm not here to argue about the ethics of such agreements, just here to warn you that you should prepare yourself with clear evidence before you can do anything. Also, I strongly urge you to remain polite and courteous in your communications with them. I've seen your posts on other threads and that's not going to help you resolve anything quicker, trust me.
Obviously, my account, a verified account, has been disabled without any excuse and I have not access to my funds to withdraw or use in trade. I have explained the details in the OP, and it is very important to take the following facts in consideration:
1- I am not alone, possibly hundreds or thousands of people are experiencing a same problem with Bittrex.
2- It happened at the very moment price surge started.
3- Before this happens, occasionally, they have put my wallets, like others, in a temporarily disabled state named 'maintenance mode' again in the critical market periods.
my suggestion: This site is a sophisticated scam that shows its face to portions of their user base in critical market situations.
I afraid there is nothing in their terms of service to allow them seizing deposits and if they think they can use it to commit fraud, they are simply wrong, they can't! Actually it makes everything for them much worse, it is a more serious crime to convince people sign a fraudulent agreement in which they give you money and the right to not paying it back in anyway while you are pretending to be an exchange, an escrow.
Bittrex has used the title "Exchange" and shamelessly continues using it now, they are not allowed to put ambiguous statements in their ToS misleadingly. It is not how things work in the financial services sector.