Did you not confirm with the seller beforehand? If not, looks like that's part of the chance you took.
In a way, he's correct.The CGC only makes a distinction of the newsstand edition is truly different. For example. CGC makes a distinction for Spawn 9 newsstand because it's made of newsprint paper, unlike the direct edition. Other newsstand books may get the distinction because they were released without special inserts, cards, coupons, foil, etc.
I'm sorry you didn't get what you wanted, but I'm puzzled as to why you didn't contact the seller first. I'm not sure it's "bait and switch" since you didn't confirm with the seller. That being said, the seller IS also at fault for not being absolutely clear about what you were getting...even though he/she did say that multiple copies with multiple certs would be involved in the auction.
A little bit of clarity and inquiry would have went a long way.