TRH
Just so there's no confusion, I'm only a fellow customer, not a HughesNet employee. The only members here that actually work for HughesNet will have "Moderator" or something similar next to their name. Liz, Amanda, Jay, Damian and Hardy are the most prominent HughesNet employees here. They are the corporate representatives that will reply to help you. Well, one of them will, anyway.
With regard to what you were told by the sales person, I can't say why they said what they did. Fortunately, though, the reps here have the ability to have the sales calls pulled and reviewed to see what the sales person said, and if they said something that isn't true, which it sounds like they may have, there may be recourse regarding the Early Termination Fee when cancelling, but only the rep can make that determination.
With the Firestick, while some people do seem to be able to use it, others have a difficult time. A lot of it has to do with system load, as well as the load on one's individual beam at any given time. Some beams are much more loaded than others, and streaming, which is one of the most data intensive activities, can be negatively affected.