Then I would take the guy up on his offer for dryer wood, and let him know that you loved the first stuff that he gave you. You really appreciate the offer, etc., etc.
I'd even offer to help him load and unload during the exchange. Then I'd start looking for pallets and scraps to mix in. It is so much more fun to burn when the wood is seasoned, but we've all been there during the first season.
+1 . . . on seeing if you could get some more of the other wood . . . and for using pallets.
I think the guy probably thought he was doing right by you when you asked for higher BTU wood and he dropped off oak thinking that it would be good . . .