Still being billed after cancelling and equipment returned

Where to start. I submitted a request to cancel my service 6/30/21, at which point I was told on the website that it would be effective as of that date and I would be called within 2-3 days. After 3 days, I submitted the request again since I was not contacted and was finally called on 7/6/21. I confirmed my cancellation and returned my equipment that same day. Maybe a day or two later I noticed I had new charges for an entire new month on my online account for service dates AFTER when I cancelled (7/11 through 8/10). I was on a month-to-month contract (which in and of itself about cost my firstborn), so there is zero reason why I should have any charges. I promptly removed the auto-billing, having heard other people's horror stories. I called to have the charged removed and was told they would be removed 7/17/21, I believe. They were not. I called again and was told they'd be removed on another date (maybe 7/25) and that I'd receive a prorated return for the time before the new billing cycle. I did receive that return in my bank account, although now the bill I am asked to pay on my online account has increased by the same amount of the prorated return. Again, on the date they mentioned, the new charges were not removed. So I called again and was told that the charges would be removed on 8/6/21, which was the new billing date. Seemed reasonable enough and so I waited. Charges are of course still there. Good thing I cancelled my auto-pay or I'd be out a significant amount of money. I called once more on 8/9/21 and was told something like there should be a prorated adjustment to the account in a few days. He said he saw that it was in process. I asked when that should be reflected on my account and he said about 3 business days. It's only been 2 days, but I am fed up with the blatant lies I am being fed by Xfinity customer service, so I am escalating the case. I don't blame the customer service reps, they're just doing their job. I'm assuming it's just very poor policy in how cancellations are handled. Strange thing is I just noticed today that Xfinity Stream is still working.