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I think it's hard to tell...I didn't use the poloniex but my friend did. He transferred the steem to poloniex and like your case, disabled, for a week till now. I wonder if he can get those back as no response from poloniex till now...

Once deposits are renabled it should appear in your balance. if not contact poloniex support

They can not return the money like a bank do when a transfer fail ?

I hope so, it's a big exchange, but they should at least send an email to explain the situation, also I logged in on the customer service platform and they never sent the activation email, what a mess.