Why are you faking the data usage monitor information???

I am a Computer Programmer with a BA in Business Information Systems and Seven Microsoft Certifications including MS Professional and MS Specialist as DBA. I use the internet extensively and until the new cap came in, our usage was less than 800 GB a month. Now, I am supposedly going over every month. My wife and I have cut our internet usage in half, yet we still go over and, because of the over charges, last week I changed our wi-fi passwords, loaded the MAC ID of every device in our home and locked the router from allowing any new devices from connecting. We purposely avoided using data on a single day so we have a good bottom level usage with all the cameras and all the computers going. On that day we used (supposedly 11 or so GB) On Thursday, December 28 my wife and I turned off all but one computer and our video cameras, and we left town. Today I get email stating I have used 86% of our data, but we aren't even home! I logged onto the Cox.net website and it shows that we have been using data for the last three days at the same rate as they claimed we was using last month. No one home, one computer and six - three and four year old - surveillance cameras with a 320x280 video over the internet when I log into them remotely through the internet. Their daily data meter shows that we are using just as much data while we are four hundred miles away as we do when we spend all day steaming on two computers at the same time. On Thursday, when we left town, according to the current reading on our daily usage, we had supposedly already used 25 GB, then Friday when we weren't even home, and still aren't and computers are turned off, Router is secured as of the 26th, we supposedly used 30GB of data!!! I am sure they will say that I am using 30 or more today as well even though I am 420 miles from home. So, to me it appears as though Cox is faking the data usage data and I think we need to start a class action law suit against them for fraud.