This is the accusation against Polonix translated by the cheated person:
Dear Sirs, I would like to present a bad experience that happened to me with Polinex. About twenty days ago I asked for the withdrawal of some zcash from their deposit account. Withdrawal was immediately confirmed by ID transaction and later the balance of my deposit account was zero but nothing was credited on my ewallet (jazz)
Two hours later I checked the transaction progress on zcash blockchain and I found out to my unpleasent surprise that ID given by Poloniex was non-existent. So I opened a ticket with Poloniex tech support but even after several reminders there are still no feedback or clarification up to today.
I received instead a prompt response from Jaxx support confirmed that ID transaction (given by Poloniex) was a fake. I don't know what to do to get my money back. Please let me know if these facts happened to someone else. What should I do? Maybe make a complaint for cyber fraud? (Maybe report this to FBI...?). Thank you... It seems obvious enough to me that poloniex is selectively scamming people here.
If it was on the Ethereum network during then ico then sure, there might be errors broadcasting the transaction due to Eth network congestion. But this is ZCash and this isn't supposed to happen because the blockchain isn't congested at all.
There are numerous other people complaining about not being able to get a level 2 verification done properly and/or have their withdrawals/deposits stuck waiting approval from poloniex. Support framework is nonexistent, and it does seem like that they are ignoring requests on purpose. Do not use them, ever.