No you shouldn't. They are very busy. I had sent a query mail regarding my application immediately after submission. My application status changed to complete and did not receive a reply either
The decisions are sent via a Decision link in your online application and a notification email.
Hi, I had applied around December 15 2015 for Summer Term II 2016. International applicant | application status completed and under review. Waiting it out. Based on previous discussions I think interviews start in Feb. and continue till end of March. Thought talking to people in same situation may relieve some stress.
Ciao.