Not everyone is interviewed. I wasn't. If I've learned anything from this whole application process is that you have to be your own advocate. And try to get everything in writing. While a bit unorthodox, I've learned that you'll hear from the school sooner if you CC a few people in your email along with your intended party. That way if one person doesn't respond, somebody else will and if you have to send a follow up email those other people will be aware of it.
The intention is not to get anybody in trouble or to be annoying, but to let the person you're contacting, and the school in general, know that you're serious about wanting to attend. If you don't advocate for yourself, nobody else will.
Good luck.