Xfinity Trade in special scam! Be Aware

I received a lot of emails saying get an upgrade to unlimited premium and get an iphone 17 pro on us. However, After I upgraded to unlimited premium, I have to pay full price for that! No credit at all! Another thing is on the website, they state the same thing. Get $1100 when you trade in. However, every time when It goes to checkout. I have to pay full $54.16 again! Total scam!