Bought a 2017 Highlander last year at 741 a month....

Bought a 2017 Highlander last year at 741 a month. Now, the payment plus insurance is right at 1000. My income has changed and i need to lower my payments before i have to surrender my only means of transportation. Instead of helping a loyal customer downgrade into a more affordable payment, I'm told the payment would exceed 800 if they did. Why? What happened to the 4000 we put down on our previous deal? That should have dissolved the negative equity on the car i traded in, but it was not, i paid the sales commission instead of the negative equity. Was told by Leon Poole he would contact me today before 8pm, never did. I really enjoyed dealing with this dealership, but since this unprofessional business practice of the salesman, I'm now in a rough situation, either i pay the ridiculously high payments or lose the car. Sure wish i would've just kept my 2007 Titan, but it's a lesson i will never repeat. I honestly cannot believe I'm being done this way, it's unbelievable. My feelings are hurt because i just may be without any car. Smh so wrong..on so many levels.