Now that you've vented your anger, could you possibly post the problem so that someone on here might be able to help?
Have you bothered to create the testmy.net account and run the tests suggested on the thread you created?
With regard to not being informed of the data limit when signing up, if you post your serial number from the modem, or a case number from a call, the reps can listen to your sales call to determine if something can be done with regard to that.
With the problems, I'm not versed enough on those sorts of things to help you, but there are a lot of people on here that are, including customers and reps (the reps on here are at the corporate level and have more knowledge and ability than those on the phone). Being that you've given some ideas of what is going on, I'm sure you will receive help.
One thing I might be able to suggest, though, is regard to the data consumption. So many times data is consumed very quickly and the user doesn't realize why. There are many things that can do this. Windows updates, the cloud (OneDrive), syncing, Facebook, updates of other programs, updates on other devices...all these things can eat your data up VERY quickly, especially the cloud. Streaming of videos will also eat up your data, especially if streamed in HD. Only a few hours of HD streaming and your entire month of Anytime data is gone. Some of the others on here have much more in depth suggestions regarding data usage and a capped service like Hughesnet, but I just gave the broad strokes.
There are going to be things asked of you on here that may seem ridiculous, but they are important. One thing I can almost guarantee that you are going to be asked is to set up an account at testmy.net and run some speed tests using that account. That keeps track of your speed tests.
If you are actually unable to connect, and I mean connect at all, that could be a lot of things, of which I'm not versed, but again, a lot of people on here are.
Just give it a little bit and someone will try to help. It may not be tonight, and it surely won't be tonight for the reps, as they are only on during the day, but someone will try to help you.