No, I don't think they would allow you to exchange them, since it's not a set they "actually sell", if you know what I mean. I'm sure they would have some dilemma with selling them back to another customer.
It's like walking in there with an unopened Land Raider from 2nd edition and trying to get a modern land raider out of it... Well, maybe not that big of a trade, but still.
Any other company, and you might get away with it. Your best bet is to sell them on here, and hopefully buy a new set with the money