I hope you get your feedback worked out, if your side is the truth.
If the deal went down the way you are describing it, please remember that you did not TRADE with him. You SOLD him a truck.
Never, ever, ever, ever, ever send ANYTHING to someone without payment first. You are begging to get ripped off. Be glad the tuition for this class was just some shipping costs to learn this lesson. There have been a lot of members on here who have lost more.
That was just plain stupid to ship your truck to someone without payment.
Good luck getting your feedback corrected. From now on, payment first, shipment second.