I very much doubt Arrow have any of the old stock left, as they've been distributing via their own site for a while now with no issues. It's most probably an old copy that hasn't sold through in Amazon's warehouse, and you were just unlucky.
As far as I am aware, the replacement program was extended and is still ongoing.
Try e-mailing Arrow at:
info@arrowfilms.co.uk with your shipping confirmation, and see what they have to say - hopefully you'll be able to get a replacement!