I am in the same situation. I have also tried sending an e-mail a week ago, and I didn't get any response back either. I more interested in the ACO program, which might be a reason for delays, assuming that all three participating schools must decide on the applicants together.
In general though, I guess that people who haven't got a reply are in some kind of waiting list. Therefore, the only thing to do, since they don't reply to e-mails, is to be patient.