I give up, replaced the 4 deco unit with another product. Nobody is expecting you to fix everything, but to fail to even engage with an issue that has been reported years ago is just unacceptable. Guess how likely I am to aware buy or recommend a tp-link product in the future?

  @KomiSaa I came from Google wifi, had it for 3 years and Xfinitiy without any issue.  Switched to the Deco because 1 of the Google mesh nodes went bad.  I then started getting warnings from Xfinity that I was nearing my 1000 GB limit per month.  Going over was going to cost me.  I thought that must be the Deco device is working better, but try as I may, couldn't find where I can see my usage hence I searched and found this forum.  A few months more and I was going over my limit, and Xfinity was going to charge me 10 dollars per 100GB over.  I didn't like that fact, so I switched to ATT, where I get unlimited data, so I stopped caring. 

My ATT device also has free network security, so why not turn it on, right?  Guess what, after I turned it on, it warned me about an attempt from the Deco device to connect to some address I have no clue about, but at least it blocked it.  Out of curiousity, since my ATT device also has data usage capabilities, I checked to see what my usage was, and it was less than 10 GB.  That's about 300 GB the most in a month, so how did Xfinity see that I used so much?!  They must be faking it, so they can charge me more!

But wait, could this be because the ATT device is blocking the Deco from sending or receiving data from somewhere that I wasn't aware of?  After all, my usage did go up all of a sudden after switching to the Deco.  Aside from that device, I didn't add anything new.  Hmmmm...you can say that it was a coincidence that, maybe, one of my devices got hacked.  Perhaps, but the fact that the Deco device is not providing this basic feature makes me wonder if they're stealing our data and that's why the data usage went so high without us knowing why and, of course, they're not going to provide something that exposes themselves.