I'm surprised their (Chambers) aren't playing ball. I would have thought they would be on this like a rash to make it better, so as not to tarnish their extremely good reputation in crosswordland.
I feel it is a case of waiting for the revised copy and checking through it when it hits the bookshops.
Obviously, this is not good for the people who have already invested their money in a ersatz copy.
I feel that ginge could be right, you may get your money back if you press on with a strong enough complaint, you have the proof that it's not up to scratch elle. They may send you a voucher for the revised version pending release in 2015