No, I haven't tried leaving the modem unplugged for a full 24 hours yet. I need to occasionally be able to access the internet for work purposes. And yes there's only the one device in the home connected to the internet.
The modem is a 10 year old WebSTAR. I mentioned that in my note to Rogers Mgmt, and they weren't concerned with that.
However, there has been a marked difference in the supposed data usage since I started unplugging the modem periodically. These are the GB usage levels below that Rogers is showing. I started unplugging the modem late in the day on the 18th.
Mar 21 - 8.32
Mar 20 - 5.87
Mar 19 - 10.97
Mar 18 - 14.33
Mar 17 - 17.44
Mar 16 - 25.23
Mar 15 - 2.24
But that's 84.4 GB in just 7 days, as opposed to the 69.56 GB that I used in 151 days prior to that. My internet usage or habits haven't changed, I haven't downloaded any new programs or software recently. It's mind-boggling to me.