Citizens advice bureau, free legal advice and they will know exactly what to do, as with them asking you go to the manufacturer is bullshit, you brought a product from them and thats means you have a legal bond with them over the product not with the manufacturer, if you pushed enough they would of just exchanged it. I had a similar problem with tesco over a kindle, they told me that i had to deal with amazon myself, so i kicked up a stink asking if i was to buy a bag of crisps or a chocolate bar that was unsatisfactory would they send me to deal with walkers or cadburys, they soon got a manager and refunded me o the spot, sometimes you have to push as they will just fob you off as most people dont know their legal rights