What a relief, after some days of nail-biting I finally received my missing coins and a reply on my support ticket saying sorry for the delay.

Don't know whether it helped but I started a social media campaign yesterday. I seemed to be right thinking there was no support during 31st of dec and the 1st of jan. After the first working day in the New Year it has been solved.

Hopefully Poloniex will get their act together getting their systems working properly day and night, holiday or not, because you can't leave your customers in silence for several days when they're missing thousands of Dollars.