billing problem that no one has resolved after 1 year!

I signed up for the phone+internet bundle that was $50 combined during either February or March of 2023. There was an issue with trying to sign up myself on the website and an agent helped me, but he made the mistake of linking the phone to my parents' address (I pay for their internet) instead of my apartment's address. The address is now linking correctly to my apartment address, but I'm still being charged $15 for phone and $75 for internet, separately. I must've spoken to over 30 people, through phone calls, online chat, and 3 agents in person from 3 separate trips to an Xfinity store, but not one person has been able to fix my billing issue! I'm recovering from a long-term illness, plus I've lost a friend to cancer recently, so I haven't been able to focus on resolving this issue for a long time. I'm being charged almost double what I should be and I really need this resolved!