My question involves vehicle registration or title in the state of: NC

I recently won a vehicle through the sheriff seized auction. The vehicle has a lien on it and later find out that the lien holder was not notified of the seizure or auction. I am going back and forth with the lien holder who doesn't want to release any information on the loan but stated I would not want to pay this vehicle off. Am I lawfully responsible to pay this loan off? If they decide to repo the vehicle am I obligated to turn the car over? What are my rights as the "Legal Owner" of the vehicle? Need advice!!!