Bait and Switch

I had seen the T-Mobile promotion for switching to them and you can get the iPhone 15 pro on them. We paid of our phones and went in to do the trade and everything, only to find out we'd only get $350 trade-in credit for an IPHONE 14 PRO! When I told them about the promotion, they acted as if they didn't know anything about it. I pulled up the website and showed them, then they were like "oh yeah"… we proceed and at the end of the process, they tell me that there is a $536.00 down payment??? If the iPhone 14 pro has a trade in credit of $1,000, and the iPhone 15 pro is priced at $999.99, why in the world am I paying a $536 down payment?? What is that going to?? And they had absolutely no answer. I'll be cancelling my service and going back! Please beware of T-Mobile not knowing how to do simple math, or knowing their own promotions.