Customer service team providing inaccurate information about xfinity mobile plans

We are a loyal customer with Xfinity for past 12 years. We are also having xfinity mobile lines for past 3 years now. Recently we upgraded the device of one of the mobile lines to latest iPhone 16 pro by xfinity customer representative by providing me a false information and tricking me into ordering the new device. I was told that there is Bogo line offer which will make one of the mobile line on my account free. Thus I would only have to pay for new device payment + data plan of an unlimited line for one of the mobile. They even told us the exact amount that I will need to pay after first month. Based on that discussion, I was comfortable to move ahead with device upgrade request. (This story continued until I activated the new device) and then came the twist in the story. I got a voice mail from xfinity that I need to call back asap to enable some credit and when I called back I was told that there is no such Bogo offer available or applicable to me and I will have to continue to pay money for both the lines + new device payment. We really feel betrayed and highly disappointed with this whole situation. How can I escalate this? I had multiple calls with customer representative so all these conversations must be recorded. I really hoping someone from xfinity would assess the situation and get back to us.