I do not recommend doing business with this guy. He has bought source code of my plugin without resell rights and started selling it to other members for half the price he bought it. He even decided to chargeback me just because he is not permitted to...

I do not recommend doing business with this guy. He has bought source code of my plugin without resell rights and started selling it to other members for half the price he bought it. He even decided to chargeback me just because he is not permitted to resell my resource - and still has its source code and most likely still selling it behind my back.

Selling unowned content
Try to have really professional arguments that actually are unfair for others