[Brainchild]

I haven't heard many things about them that haven't been negative. Most of those were people complaining about getting only getting a certain percent refund on cancelled preorders and being told that items were out of stock after preordering, so your situation sounds different. If they stopped answering your emails over a significant period of time, then PayPal dispute sounds like your best option.
Also, when did you pay for the SHF shipping? I imagine early November, in which case that's pretty much covered with the PayPal dispute. Did they normally take a long time to respond to the emails that you did get a reply to?