If the user knowingly bought the coin while the wallet/withdrawal was disabled then I'd say LiveCoin might have a point but they need to unblock the account. Idiots buying worthless shitcoins is not something an exchange should be responsible for. Still it's a shitty move to allow trading in these circumstances. MONA is trading 75% lower on LiveCoin than it is
elsewhere.
It appears they have another coin that they disabled the wallet for quite sometime and continue to allow trading. The coin happens to be Monero... from what I can tell, it appears Livecoin wants the Monero team to compensate them for 1.8 million worth of losses.
https://www.reddit.com/r/Monero/comments/brd4nf/livecoinnet_xmr_wallet_offline/