After I filed a second ticket, I have at last received a response. Obviously they didn't want me lengthening their backlog of unanswered tickets, I threatened to post a new one every day (it's now been 17 days since my steem disappeared into their dirty nether regions (i mean wallet)).
Dear David Vennik,I am very sorry to inform you that we are currently experiencing a momentary problem with the wallet and had to disable it for maintenance.
As soon as the wallet is re enabled your deposit will credit.
Thank you for your patience and I am sorry for the inconvenience, don’t hesitate to reply to this message if you have any question.
Sincerely,
Poloniex Support Team
Ticket: https://poloniex.freshdesk.com/helpdesk/tickets/294016