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I would reconsider your conclusion that you have no basis for a dispute.
A dispute is not limited only to the legitimacy of the debt per se. It can relate the accuracy of any item of information that has been reported.
The amount of the current debt balance can be the subject of dispute without asserting that there is not debt at all.
A furnisher assumes the obligation, once they report information, to promptly update that information as necessary to maintain its current accuracy. FCRA 623(a)(2). thus, they cannot, if info changes, simply neglect to update.
If you have documentation that the vehicle was sold, then you have basis for a dispute of the accuracy of the current debt balance, which should represent only the net debt after sale of the vehicle.