Customer service- handling loyal customer since 2019

So I chatted with people yesterday. Our internet cost us $153 a month for 600 mpbs. Promotion being offered is 1 gig for $60 a month. That promotion I know has been going on for the last couple of years. But since we are a loyal customer since 2019 we can't get that. Instead we continue to be overcharged paying for slower internet which no one ever calls to offer you something better. I would of continued to keep over paying like I have for probably a couple of years if I wouldn't of message. Didn't seem like they cared. I explained I wanted our account to be review for the last couple years for being overcharged. Yesterday rep said he could offer me $81/mo for 1000 mpbs. Explained to the rep I did not want to authorize a change until I spoke to a supervisor. The rep made the change to $81 and then added a pro thing for $15 without my authorization. I said I wanted to wait till I spoke to a supervisor. Started a chat again today. Going through the same thing that I want our account reviewed and wanted to speak to supervisor. Got thrown around for a little bit then to supervisor. Then as I was stating everything again about being over charged for years, the promotion, the changes being made without my authorization, wanting our account reviewed he went back to the $81 a month. Then when I kept coming back with my questions asked what difficulties I was having with our internet. I told him and without even saying anything transferred. I want our account reviewed for the last couple years, I want a good offer and a credit on our account. We have been handled horribly.