I've also purchased a tee from Dirty Microbe and received zero merch and zero response from all attempts at contact. I joined Facebook today, for the sole purpose of emailing Christian Von Kleist.
Here's what I wrote:
Christian, As I am sure you are well aware, there are major problems with dirty microbe. I placed order#XXXXX with dirty microbe on July 5th. I have not received my order, nor have I received any human responses to the emails I have sent. I no longer care about the merchandise. I want my money back. When I called my bank about the matter, they informed me that I would need to work with you to make that happen. So I am making an appeal to you in order to get a refund. If I do not hear from you, I will file a police report as advised by my bank. Alicia
Unlike primesuspect, I received a rather prompt response:
Alicia,
Hi! Wow, this is the second Facebook request I've had about Dirty Microbe! It really sucks when your company is letting people down, so I'm really sorry about your late order. 
We're experiencing a lot of missed orders, slow support e-mails, and other problems at Dirty Microbe since I left in May, so it's a tricky situation! I hope I can fix things.
I just refunded $33.98 to your card, and you'll see the credit appear in 1-3 days (usually within 24 hours).
Thanks for letting me know about the problem, and I'm really sorry for the trouble. We've shipped over 8,000 shirts since I started Dirty Microbe and always had awesome customer support, but in the past 2 months we seem to have disappointed lots of folks.
Let's see when my refund shows up. Hopefully this is not long and drawn out for me. And hopefully anyone unable to get a charge back worked out will be able to get a refund too.
I also joined a number of forums, this one included, in order to get the word out that these people are doing bad business.
@Primesuspect: Have you received your refund?
Edit: I wonder exactly what he means by "since I left in May"?