For what it's worth, I think Poloniex is currently owned by Circle.
It is likely reflected on the last active day of busoni, 22th Feb 2018. I don't check back history when Circle took over Poloniex, but maybe around that time.
How long have your issues with Poloniex (with your 10 XMR) lasted? Recent months (after Circle-take-over), their supports have been fast, so I think if you sent support tickets, your issues will be solved, after all.
I have a similar issue with poloniex for 10 XMR but I don't think they even have an account here.