cwescott92,
Eek! Cut that cable! LOL. DirecTV will for sure eat through your data like there's no tomorrow.
I had connected my DirecTV to Hughesnet last year when I had my old legacy Pro plan. I just wanted to see if it would connect with wifi. Well, when I did so, it changed a lot of things on my DTV receiver, as it now thought I could use the internet for it all the time. I was able to disconnect it from wifi, so to speak, but the changes that had taken place didn't revert to what they had been pre wifi. To make a long story short, I ended up having to do a factory reset to get it back to normal. I lost everything on my DVR. Two reps couldn't help me to figure out what to do, and I had to figure out the factory reset on my own. Even though I lost everything, it was worth getting it back to normal.
If you have Windows 10 on the computers, you will want to make sure that they aren't using the cloud (OneDrive) and aren't syncing. To turn syncing off go to settings, accounts, then "sync your settings." The top option on that page should be to turn your sync settings on or off. Turn it off. As for the cloud (OneDrive), it may be on in your system tray. Right click it and go into the settings (I forget exactly what it says) and change it so it doesn't start on startup. I can't remember if there's anything else to change on it, but check anyway. Then exit out of it to turn it off for that time. It won't start again when your computer starts next time. The last thing with regard to the cloud is to go into settings, system, then storage. Make sure all of the save locations are somewhere on your computer, whether "This PC" or your C drive. Just make sure none of them say anything about the cloud.
Also, go into settings, then Update & Security. Click on Advanced Options, then Choose how updates are delivered. Turn off "updates from more than one place." That's another thing that will eat up some bandwidth.
Then make sure Facebook isn't set to play videos automatically.
Those few things alone will probably save you a lot of bandwidth.