Hi, I had to call a bunch of people - you can usually find who's responsible for your program if you go to the apply yourself website, click on the program, and then it should list the description, requirements, blah blah and a list of people who are responsible for the program. You can also call the general GSAS line and they were the ones who directed me to the correct person. They are not in the best of mood as they expect your call to be asking about your application status, but just plow ahead and tell them it's regarding the completeness of your application. I had to phone 3 people before getting to the right person, so don't give up. They were fairly nice and helpful once I got to them. Best of luck!
sorry, I meant to say it wasn't helpful calling my program, they don't know anything since GSAS forwards everything to them, so GSAS are the people to talk to.
Sorry, I keep editing. I did call the program, and they were the ones who told me that my application (which was almost complete was being considered), but on my application it said "At Department". So you may want to check with them first to see if your application is being considered. Hopefully it's okay.