To check whether there's a data leak and where it may come from, please follow the procedure detailed below.
Please perform the following test outlined in the graphic below, though follow the full instructions written below the graphic. This is known as a Modem Isolation Test, and it will help to determine whether the issue is with HughesNet or your local network..
1: Disable the WiFi in the HT2000W modem.
2: Take a screenshot of the Home page of the System Control Center, along with the clock on your computer screen.
3: Disconnect the LAN cable from the modem, noting the date and time of disconnect.
4: Leave the LAN cable disconnected from the modem for several hours. HughesNet recommends doing this overnight, or during the day while at work. DO NOT unplug the modem from the power. The modem must remain powered.
5: Reconnect the LAN cable to the modem, noting the date and time of reconnect.
6: Take a screenshot of the Home page of the System Control Center, along with the clock on your computer screen.
7: Post your screenshots to the community.
The screenshots should look similar to the following, being dependent on the operating system, with the system clock included (you can move the System Control Center data level window to being near the system clock so that it is included more easily).
Do not unplug, power cycle or internally reboot the modem after the test has been run, as the reps need to be able to reconcile your modem data logs with what is shown in the screenshots. Any of those three things will wipe out those logs, rendering the test results moot. Only after the reps have responded with their findings should any of those three things be done.
Please be aware that, if you downloaded any large files just prior to this test, some usage may appear to have occurred due to the slight delay (lag) in the modem reporting the data usage to the server, but it should be rather negligible.
If you don't know how to disable the WiFi in the HT2000W, please see "How do I manage my built-in WiFi modem?" in this PDF. Please be sure to click "Save Settings" after unchecking "SSID Enable" for each of the four tabs individually (2.4Ghz, then 2.4Ghz Guest, then 5Ghz, then 5Ghz Guest).