How did you pay for it? If on a credit card, you have Section 75 protection for a longer period of time than most people think. Always buy costly items on a credit card to ensure you have protection above and beyond standard warranty.
This is still within the 1yr sale of goods warranty period though, so I would tell them you are getting trading standards involved. When retailers get stupidly obstructive, they can be leant on more than you think. Unfortunately many try it on. Don't give in if you truly think you have done nothing wrong and been sold a dog.