Where was the vehicle purchased? At a dealership or a private sale? In what state?
Did the vehicle get registered?
Generally, if you purchased a new vehicle and resold it or traded it in, even within 2-3 weeks, you still owe taxes on the vehicle.
This answer does not, nor is it intended to, create an attorney-client relationship, but is offered solely for informational purposes. Since the facts of each case are different, it is important to seek out qualified counsel with whom information can be shared and assessed under an attorney-client privilege so that competent and tailored advice can be provided.