Booked a flight a couple of months ago and paid extra for two reasons, so we could be together and also not to be over the wing and have a better view. In the meantime, aircraft was obviously changed to a smaller one and our seats were changed to over the wing. Would you ask for a refund?
I think normally I'd leave it, but we also had the inconvenience of a cancelled flight and a premium rate phone call to change (not sure how much this is going to be yet).