How to further escalate beyond customer service agents and supervisors.

Xfinity customer service has put me in a jam because of constant incorrect information/advice. i received an email stating i could get free mobile service for 12 months because i was on the Internet essentials plan. So I called in to ask how long will that promotion be available because i wanted the Galaxy s24+ but i just bought a car and couldn't spare the sales tax for the phone. i was told to try the pixel 8 for free because he couldn't tell me how long that promotion would be active. he said just return the pixel 8 within the return period if you don't like it. what he didn't tell me was that I'd lose my 12 months of free service because it's now tied to that pixel 8 phone... that's something i should've been told because i NEVER wanted the pixel 8. i was under the impression that the promotional offer would simply switch to whatever phone i added to the service. after eventually being told i would lose the free service, i called to speak with an agent who said i could just trade in the pixel 8 towards the Galaxy phone and something like half the price of the pixel 8 would be added to the cost of the new Galaxy 24+ and then split into monthly payments. i was later told that couldn't be done. so now I'm furious and want to speak to a supervisor who tells me she can somehow trade this pixel 8 towards the Galaxy and I'd owe nothing on the pixel...i KNEW this couldn't be done since the pixel was brand new and owed payments, but she INSISTED even with owing payments the phone could be traded some way. again i didn't have the money at that time to spare for the sales tax and first month payment so i asked her to call back on Sunday, which of course she agreed, but didn't. when i call back to finally trade in and get the phone i ORIGINALLY KNEW i wanted...i was told the phone can't be traded until it's paid in full. not only that... apparently my account is on autopay that can't be removed and I'm being charged for either the phone or the service which BOTH should be free!!! i NEVER EVER EVER KNOWINGLY sign up for auto pay for any service so that should've been made very clear just like ANY other company would. so now here i am completely stuck in a phone and situation that i never asked for or wanted... and ABSOLUTELY... POSITIVELY... ALL!!!! of this is a direct result of xfinity customer service not thoroughly telling me what happens if i return a phone they suggested i try. had i known I'd lose 12 months of free service for returning a phone suggested to me that i knew i didn't want because of the reviews... i would've said no to even trying the pixel 8. at this point i don't want to cancel my service and bank account... but I'm pretty sure that's the route I'll have to go or be stuck paying for things i shouldn't be paying for. ANY resolution would be appreciated.