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Have a read of this link from the forum. Follow the steps and send a letter, along with damage report, to your retailer's head office and hope they will see the light and replace (or at least repair) under Sale of Goods Act.
Page 2 will probably help more, but have a read through the whole thing so you know what you're doing/talking about against the retailer. Oh, and make sure you've got the original receipt or your out of luck.