Until they respond, I think the only thing you may be able to do is to call. Here is my reasoning:
So I am in the School of Biology. If I had sent an email to the Chair of the Grad Committee he may have been able to respond quickly or reasonably, but he has students working for him, too, and on top of that he has all of our stuff to sort out. If I had sent an email to the head of the SOB, he probably wouldn't have been able to respond (assuming he doesn't have a secretary taking care of all of this for him) because he is a very busy man and can't really stop to research something like an admission or rejection. We have two awesome people we go to for anything. The first is a person who is our initial advisor if we join the program but do not select an initial faculty member to work with, while the second is an awesome lady in charge of handling any questions we have about the grad program. That is what they are there for - and I spent plenty of time in their offices prior to matriculation to ensure that I was completely set with everything I needed. That was my networking. :-) But if that helps, that is who you should be contacting. I would assume ECE has the same structure if not more people to assist with your issues, you know? I wouldn't be looking for a secretary or the head of anything and maybe not even an admissions department. I would go to Academic Assistants. If you've already done this, then... just be hopeful. Otherwise there's really not much else you can do. I happen to be from Georgia, so I drove my butt to Atlanta to get answers to my questions -- if it's possible for you, you should do the same. :-) Good luck!