Very similar experience. I had ordered 2 floor standing speakers and a subwoofer on 11/28 and received conformation for both. After no status updates and reading your message, I checked my order and now only the floor standing speakers are there. My card was only charged for the speakers. they have not shipped yet. I tried the support email on the 3rd party processing website and received the following:
Your message to support@shopatron.com couldn't be delivered.
support wasn't found at shopatron.com.