Only Scam I would suspect is what they paid you for what Cars !
if they under Paid you one Might consider that to be something to think about .
Why don't your post what you sold Model /Year and for how much $
Since that's the basis of your post yes ?

Example : $ Car selling for $10,000 to $12,000 in good condition and they paid you $2,500
Then you can decide what you would call that