Still Being Billed 16 Weeks After Cancellation

I started a new Xfinity internet service at a new address in September and the Xfinity service at my previous address was supposed to be cancelled on September 30th. Despite contacting customer service about this about 15 times via phone and chat and repeatedly being put on hold and transferred, so many of these instances were over 2 hours each, this situation had yet to be resolved. I was promised that the billing would stop and I'd receive a refund, but I'm still being billed for the old address (even though I received a cancellation notice months ago). I'm also being billed for Peacock when I shouldn't be as it's free with my new service and my Flex box doesn't work at my new address, as it's still linked to the old address and it won't let me reset it unless I pay the bill for my old address, as I stopped my autopay last month. I can no longer log into the old account, even though I've been trying repeatedly over the past 2 weeks, but the last time I did log in, it wasn't my phone number in the profile and the app wouldn't let me change it, as my actual number is already in use with my new account. Please do not waste even more of my time with a "We're so sorry this happened and we understand how frustrating this is" type of message, just fix the problem.