xFi gateway added to account, not requested or authorized

Service changed to xFi Connect, when all I wanted was to have the Unlimited data service put back on my account, as it was as of 15 March 2024. Been a customer since May 2016, have always used my own modems and routers. Had a xb8 gateway and used it for two days, before returning it to the local store, where I'd picked it up. This was only at the insistence of a tech support agent that claimed my equipment wasn't getting 1200mbps, even after I explained that would be impossible, since the LAN ports on the router and the PC's ethernet port were limited to 1Gbps, resulting in speeds <950mbps. Logging in to my account on Xfinity website, selecting Internet, it very plainly and clearly shows that I can get Unlimted data service using my own modem. In trying to do that, a message appears, saying 'Temporarily unavailable'. I had been paying $110 a month for 1200/35 service plus the unlimited data service. Today, I was disconnected from a game I was playing and after checking my account, found that someone, at Xfinity, had removed my CM2000 Netgear modem and, in its place, put a Technicolor gateway on my account. I have NOT requested a gateway nor do I want one. I just want the unlimited data service, that the website says I can get, since nobody I've spoken to, speaks clear English, talks too rapidly and left me confused. The gentleman I spoke with half an hour ago, said he was going to escalate this unauthorized change, to security, which is a good thing, since I do NOT have any Xfinity equipment.