Yup, their meters definitely don't work
I kind of am the opposite way. I had a day with a 100GB spike, which I had no idea what happened that day.
I called Cogeco because I was at 95% of my cap (I got SOHO 200GB cap) with no warning email and they said I was only at 75GB downloaded.
So obviously their meters don't work, my report has me over 200GB while they are probably only 100GB in actuality.
Unfortunately, where I live, it's Cogeco or nothing.