At this point it would be difficult to track them back down, the best option is to write it off as a mistake and move on.
With things like this it's best to vet your artists before you offer to buy their services.
That's perfectly fine. I looked over it again, and figured if the guy was insulting when I was offering to buy his services, the risk of him just taking my money and running would be far greater than normal.
If one has a situation where an attempt to purchase a commission slot has ended in a one sided hostility, would it still be considered a beware or would it just be a personal thing that should be disregarded?