Not to accuse you further,but you really messed things up when you sent them fraudulent ID documents. Also 10 btc may be above the threshold they can process without IDs.
True, but does that give them the right to his coins? A simple yes or no would do.
It may be a policy thing, it may have been covered in their terms and conditions .which would give them the right to do such,also if you trust a site enough to send them your tokens -100 BCH-, then you should trust them enough to provide them with some identification when they requested for it.