You should still get in touch with them about what to do with your yuan. Maybe request an equivalent in Bitcoin or some other crypto?
Their reply to CNY withdrawal requests as crypto or other instructions:
I am afraid you can not withdraw CNY .
CNY can only be sent to bank account in mainland China under your name.
And if you reiterate that you ask them to convert CNY to BTC or other crypto they just stop answering.
BTC38 (another Chinese altcoin exchange) closes down much more gracefully - allows to convert CNY to crypto, resolves tickets etc. A pity that BTC38 has to close down as well, no regret for BTER.