Just an idea. I noticed your comment above, and if you feel a little uncomfortable with talking on public message board due to your concerns being more involved, or if you would rather deal solely with the reps, you can always create a new post and make it private during the process. With doing this, only the Official Reps can see your post and replies and only they can converse with you, which would keep it completely private for you. The reps on here are at the corporate level, have a lot of experience with helping to pinpoint problems and solutions, and can speak directly with the engineers, which may actually give you much more thorough and involved support than what you can get from the phone reps.
Again, this is just an idea, but I thought I would mention it.
Amanda posted earlier:
"Just saw your second post. Glasswire is used by many of our customers here and I personally do not see it as a threat, but I don't see it as user-friendly either. I found it kind of hard to navigate myself and don't like that you can only monitor whatever its installed on. I would really recommend getting firmware for your router to do this instead. I believe our members have a recommended one, can't recall."
I have used Glasswire without issue for over a year. There is a lot of information displayed so "navigating" could be a little difficult at first but there are a couple of "views" that go straight to the problem ... what used my data and when did it occur.
Here are a couple if screenshots:
Understanding the output:
Defining a specific period:
The downside to Glasswire, as Amanda stated, is that it will only show traffic on the single computer on which it is installed. While it can be installed on multiple computers and the data correlated it still leaves the issue of wireless devices.
The only sure way then is to remove the router from the picture and test one computer at a time or get a router that will allow the use of third party firmware such as Merlin that will run on certain routers so that the router can track usage by device: