Number called and didn't leave a message.  Called back and got a nondescript customer service voicemail.  She stated her name, but not the company she worked for.

After calling back again and trying the alternate extension on her VM I reached another guy who asked me if I placed an order with them.  I said I didn't know who "they" were and he rattled off the name of about four companies until I recognized OnSale.  It seems like they are a processing center for them.  The actual company name is OSRP.

I told him I had placed an order and he asked for my email address and he verified the item I purchased.  He then asked if he could place me on hold.  I've been holding for 10+ minutes and counting now.  About to hang up and call OnSale customer service, but I'm guessing that I'll be on hold for just as long.