I am a very dissatisfied customer. I bought a 201...

I am a very dissatisfied customer. I bought a 2016 elantra. The very next day I saw a 2015 elantra with all features that I wanted for less price. So, I asked them to just switch the 2016 with 2015. They said, I should trade in the car that I already bought and the trade in value would be $1200 less than what I paid a day before. Their little effort to switch the car would have been my 5 year happiness. Just less than 24 hours, they did not let me switch the car. There is normally a 72 hour window to switch a car. I am a very disappointed customer.