Well, the good thing is that you haven't paid him yet. But, by calling him out, he probably wont try hard to help you.
I had bid on a few of his items before. Each time I was outbid by the same "person" and he sent me a 2nd chance offer some a ridiculous amount. I just ignored him and stopped bidding on his stuff. But, I would avoid him from now on and hopefully everyone else does too after your run in with him.