I feel cheated/scammed

Were you upgraded to a Fusion plan (or perhaps already had that)? The reason I ask concerns the gaming. The latency with satellite only internet, or at least geo satellite internet like HughesNet, is far too high for real time gaming. Turn based games are fine, but not real time games where quick movement/reaction is a must. 

As for the data usage, something connected to your service is using a lot of it. The trick is finding out what that is. Online gaming itself doesn't tend to use a lot of data, but game updates and other downloads can use a ton of it. Streaming is the biggest data hog for most people. 

BTW, you'd be better off messaging Kathy. Just click on her name, then "Message" on the lower right of the wide box near the top of her User page.