Devices using data without the person knowing is nothing new. More and more devices stay connected, even when they are turned off, and they can use quite a bit of data. If you'd like help in figuring out what is using your data, please create a new post in the Tech Support section, which you can do here...
This is ONLY concerning your data loss issue, not the service issue in your first month.
In the meantime, the following two threads may help...
I’ve totally disabled everything as I have to type in password for every device to even connect it to the internet. So there isn’t any devices depleting the internet. Also, they have told me time and time again that there isn’t any devices connected. I am 100% there isn’t any devices on the network. Not a phone, laptop or anything.
You should still start a new post in tech support if you would like help with this issue.
I'm sure a rep will respond. They're on M-F from approximately 8AM to 5PM EST, though it can take them a day or two to reply.
Good luck to you.
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We can help you in the community, then. I'll go ahead and move this thread to our tech support board. I have no problem escalating your case to engineering if the HughesNet modem is showing significant usage while isolated. Follow the instructions here to get started.
Your cooperation and patience are greatly appreciated. We look forward to hearing back from you.