I don't understand actually what you mean that Hitbtc is fraudulent. If you face any kind of miss case you can give message to support team of Hitbtc. i think they will solve your problem. I did not find any problem when i made transaction on it.
Support really? If you know anything about HitBTC, then you will know that support has been dead a very long time ago. I still wonder till today why people use them and the other shit exchange they call Yobit. For the OP anyway, there is no point filing a lawsuit, just move out, forget all you have lost and forget. Keep spreading the gospel though so other users may know beforehand if they want to consider making use of the platform.
My issue before has been solve by hitbtc support when they notice it and I can't blame them to act slow since most provably their system has been splendid by deposit/withdrawal errors but if you can't stand to trade with them then much better that you step out on that exchange. Since for me as long as the coin which I looking for will be added first on them I will stay and go trade with careful plays.