Retailer asking for more money after the sale?

Ok today we bought a wardrobe in a closing down sale, (not MFI!) It was a really good price and sold as seen. The wardrobe is still in the shop due to be delivered on the 15th Dec. A couple of hours later they rang me to say that they had made a mistake and I had to pay an extra £100 or they would refund me. Can... show more Ok today we bought a wardrobe in a closing down sale, (not MFI!) It was a really good price and sold as seen. The wardrobe is still in the shop due to be delivered on the 15th Dec. A couple of hours later they rang me to say that they had made a mistake and I had to pay an extra £100 or they would refund me. Can they do this??
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