matti
Just for info, when viewing one of your invoices on the Hughesnet myAccount site, you can scroll down and click on "View Site Details" on the bottom left. This will give you a more detailed view of that particular invoice. You should be able to see just what part of your bill increased by comparing a couple. Here's the address for the Hughesnet myAccount site...
http://my.hughesnet.com/myaccount
This is just for your own info, though, as the reps will need to address the deal and your bill increase. They are on M-F from approximately 8AM to 5PM EST, so the earliest you may hear from them is Monday. Though you posted while they were online, it can take a little while for them to answer, so they probably just didn't get to your post today, unfortunately.