Carvana complaint: Selling price changed because of their fault

In July 2021, I did the appraisal with caravan, and made an appointment for selling my car and pick-up within a week. But my appointment kept getting pushed back. So first, for the first time the staff who came and picked up, my name on all documents for me to sign was wrong. So we rescheduled, the next time when we met, the staff told me the check was not ready because of the wrong name they put. But before that, I already called customer service and ed with them that all names were corrected. Then they were trying to change the payment type to direct deposit and rescheduled my appointment again, but because of their technical issue, I couldn’t make a change. Then they suggested me to create a new account. I did, but the appraisal value dropped down like $500. And they said they could not go for the first appraisal amount. The first appraisal value was actually expired in August.