iphone 11 trade in

Happens to me, told me I'd get $850 with 650 applied to bill over 2 years and 200 back. Once I sent my phone in they did the same thing they did to you and tried to tell me I would only get less than $200. The agent who convicted me to switch over changed the detains to increase the amount of their commission. My black iPhone 11 128 gbs was listed as a red iPhone 11 256 gbs. 
 

I had to live chat around 4 different times and each time it was "solved" but then I would get an email about an issue with my trade. Finally the last time I called they gave me the promised amount. I was making them check my chat logs to see where I was promised a certain amount and I'm not sure if they played back my phone calls but I was asking them to