We’ve all been through that… it’s unfortunate. Envato could review the reversal claim for both parties to see if it was a serious problem or just an angry impulse response from the client. The reversals are not fair at all, while the client gets his money back, the client still has the project and can do whatever with it.
This is not fool proof. For example I purchase your project and then I want a refund for a nonchalant reason. I still have the project but I paid 0 cents for it. Envato should really look further into this because it continues to be a problem.
Cheers!