How can I resolve this false equipment return problem?

A month or so ago, I had noticed that when I tried to log in to the Comcast web site to manage my account, it was continually put up a message telling my my bill had been changed and basically giving me the "option" to either ignore the added charge, or agree to the added charge. Whichever option I selected, invariably it would require I log in yet again one or two more times.  Not that anyone who can actually do anything about this is paying attention, but Comcast apparently goes by the motto "No good deed goes unpunished", the reason I say this is my wife and I have a second home and two Comcast accounts, and I can tell you, DON'T DO IT.  Comcast's account management software was never written with the idea that single customer might have two accounts, and it is just bonkers the number of times I have to re-log in, after I'm already logged in (throwing in all of the two factor authentication who-haw etc.))

Since it appeared to me that the extra charge was for some sort of "Service", and we had had no service calls, and there was no online method provided for me to disagree with Comcast's desire to charge me more money, I finally called the phone support.  After several calls, and an hour or more of waiting, the poor support person on the other end conjectured it was because Comcast was billing us for the return of some equipment that they had only just shipped, they had shipped new replacement TV set top boxes (which we had not requested). Since the new equipment had only been here for a week, I had not returned the old stuff yet.  (Luckily, because instead of sending two pieces in the same box or at least on the same day, the two were delivered a week to two weeks apart, and if I had rushed to return the first I would have been in for a second trip.)

I can now look at that bill and see how "Service" could mean a new set top box, though honestly, was it worth all of my (and Comcast's) wasted time over a poor choice of words?

So guess what the equipment has been returned, and THANKFULLY I requested a receipt, because now Comcast is telling me that I have not returned the equipment yet.  Weirdly, if I click on the only button available "How to Return", it only shows me a listing of the new equipment and lets me return that.  (I'm tempted!)

Since the equipment return was done more than two weeks ago, can I assume that the pony express rider from the Comcast store just has not arrived at the billing headquarters?  (You guys should check out this new Computer and Internet thing, it is great!)

Not that anyone has read down this far, but I miss the period about ten years ago when some Comcast big-wig got sick of being made fun of on late-night television (hmmm the irony of having to broadcast "content" derogatory to your brand!) Apparently this big-wig actually followed through and for about seven of the last ten years, the quality of Comcast's phone support has been within nipping distance of Apple's IMO.  No more.  Now its the worst of the worst.

And if somebody who can do anything (AI?) is reading this, I would suggest at every step of the support process, the assumption should be made that the customer has a clue, and that Comcast's systems are wrong. EVERY communication, if it is requiring an action from me should have a button that basically says "Something is wrong" (meaning something Comcast's systems have as data is wrong)

...And if just to prove that your systems are almost always totally screwed up, when I clicked on the "Sign in" button at the top of this forum. I got two different errors in two different browser brands:

(I think prod-xb.sprinklr.com, whatever that is is down or inaccessible.)