That's enough. You have a refund, and this is being locked as there are no more productive things to be said. All that's happening are potshots at each other, and that's not what we are here for.
Edit: I also want to stress that the artist is within their rights to refund you. He didn't claim that you threatened with a chargeback. He said that he felt you were the type of client who might do so when they aren't getting their way. This is his way of washing his hands of this transaction, and at this point you need to leave him alone from here on out. He's established a boundary, and it's time to respect it.
Also, he's within his rights to repurpose art as he sees fit. You don't own it. This transaction is resolved, because the artist has chosen to resolve it. Please understand that if you continue to poke and prod at him when he's already made it clear that he wants this to be over and done with that you risk the artists who read this not wanting to work with you in the future.