I say first, login to your account and get a tracking #. I haven't ordered from SpinGear before, so I don't know what their after-sale information is like. Rewind's is good. YYE and YYB are also good. Assuming you get a tracking #, see where it is. It won't be perfect, it could be sitting somewhere.
File a claim with Paypal. You paid via Paypal, they offer certain protections against this. That often gets people moving.
Phone calls and emails are always good IF the other side is responsive and/or trying. Just with my experience with where I usually buy from, customer service is typically excellent. I find YoYoSam's to not be at the same level as some of the other places, but their offerings are so diverse that they may have far more emails to deal with. With YYBB, I can call him up. With YYE, I can send an email to the "top", but I'd rather go through their normal channels because that tends to be quicker as I'm dealing with staff it handles that when I do that. I even called once, but that was due to an issue I deemed urgent as they were about to make a mistake on my order(and ship something that wasn't being paid for). Yeah, it delayed my order a day, but I don't are about that. YoYoRewind is a bit slower than I prefer, but it seems like it takes it an extra day just due to the time difference. I know they have English speaking staff there. SpinGear must have customer service, even if it's the guy who runs it. What I hear is that those who run these smaller operations end up saying it's a full time second job. He might be overwhelmed. I'm not excusing anything as they still should try to get through emails in the order received.
I want to hear how this turns out.