Xfinity mobile "bait and switch"

On 3/20/2024 I contacted Xfinity to inquire about moving my 2 mobile lines from ATT to Xfinity. I did this via chat. I got a "deal" for $15/mo per line for 12 months. I also wanted to take advantage of the trade in to trade a Samsung S10e for an S23. I was told it would be $8.33/mo. for 24 mos. While the agent was finalizing the transaction, they came back and said since I wasn't already an Xfinity mobile customer, I needed to wait to receive the new SIM cards, activate the lines and then come back for the phone. I was skeptical so I printed the chat and also got a chat ID number from the agent as "proof". Well, I did all the steps and when it came to getting the phone, it was now $29/mo for 24 mos "because the deal only applied to NEW lines and I'm now an existing customer"! After countless hours with countless numbers of agents, plus a visit to the Xfinity store (where I was told he wouldn't help me because he wouldn't get commission) it is now 3/30/2024 with NO resolution. I stayed on hold for over 1 hour with a "supervisor", Dray, before the call dropped. I view this as a true bait and switch but can't get anyone to resolve the issue.