bro, wait.

Go report police.
Then when case starts, he will say want refund u to close case.
Thats the time u can ask how much u want.
He con u 160, u can ask him 2 k or 3 k to close case.

Try it if u want. I tried

I bought a new X8, but check check it was used.
Sticker resticked, contacted the previous owner.
Then he paid me 5 times the price.