Xfinity is at best inaccurate, at worst FLAT OUT lying about my data usage and exceeding the 1TB usage cap

I got a text this morning that I was 100% over the archaic one terabyte limit imposed by this company. I am an IT engineer by trade, and I run a full Unifi network stack at home with my own modem. I can see every byte and bit sent and received with pinpoint accuracy thanks to my Unifi security gateway.

I have only used 356 GB from November 1st, to today, November 28th and I have the receipts to prove it. Not even half the months data cap of 1000 GB (1TB)

I have spent hours trying to reach someone at Xfinity/Comcast customer service who even understands how the cap works or what a Unifi Security Gateway is... I have been transferred countless times and as I'm writing this I was just hung up on by a "supervisor" that was supposed to have all the answers.

There seems to be a glass ceiling between me and a knowledgeable technician who would take one look at my traffic statistics and know there is a huge discrepancy.

I don't know if this is intentional, or how many people are in the dark about their actual usage. But it sure seems like I'm being taken for a fool. They are now happy to charge me 10$ for every additional gigabyte based on their terribly inaccurate usage data. If it feels, smells, and sounds like a scam...

How many others are being taken advantage of in this way? I will be cancelling services with this predatory provider.