OK. I have dealt with this. Due to the glut of incoming applications even the customer service line is turning folks away. MOST of the time they do not even give you the option of holding for a rep...it just tells you try later and then hangs up. Just keep calling!!
You can't add expedited service to your application until it is recieved and they deposit your check. For me that took just a hair over a month for them JUST TO RECEIVE the app and cash the check. Until they cash your check, your app does not exist to them. Keep checking with your bank to see when the check clears. After it clears, call constantly until you get through 1-877-487-2778 to add expedited service to your app. My parents expedited app took one week (about 3 weeks ago).
My app was sent in on 1/19, and it is reported to be to me by 4/20. Luckily my trip isn't until October.
DO NOT RELY on the info listed on the website as far as whether or not you are "in the system". It's a lame, outdated system (even according to customer servcie) and rarely gets updated correctly. Call the 877 number for help and just keep try to get through.
Remember though that they cannot help you at all until your check clears, so don't bother calling until it does.