What Do I Do When A Company Does Not Respond?

Hello, recently I sent someone a Gameboy for customization. However, as of 12/23/13, the seller has not had any contact with me although I have sent him multiple e-mails, one on 12/30/13, one on 1/4/14, and one on 1/6/14. Can anyone help me? This is an online store so I can't just walk in and ask to speak to a manager. What should I do?

TedEx2014-01-06T18:28:50Z

Are they still in business??> Businesses like this come and go.

Try googling their web site and see what happens.