One thing you might want to try is canceling your membership and in the reasons mention that you want your shit. That's one way to get their attention. All it will do as add a scheduled cancellation that you can click uncancel on at any moment.
I got a response fairly quickly the other day by filling out the form for an order situation and then wrote WHERE IS MY ACCOUNT CREDIT! really large in the subject and when it asked order number, wrote something like, I DON'T HAVE ONE! IT WON'T EVEN REGISTER IN MY ORDER! or something to that effect. I'd selected a swap for credit and they never gave it to me on the 2nd. I got a response super fast on that one, too. If they aren't even reading your emails, whatever is in that email might not be as important as the way you contact them and if you can get them to look at it.