I'm angry as hell about it but have no idea how to proceed. If it had been priced at £3 or whatever then it would have been an obvious mistake, but £129 appeared to be just a fantastic discount offer and I bought it in good faith. Amazon have behaved appallingly and I consider their quoted pricing policy to be outrageous. Surely they could price any item up at whatever the hell they want, enticing people to buy, only to up it later -- with good odds the customer will pay the new price, as by already placing an order (rather than merely viewing the item) they've demonstrated they want it.
I frequently place stuff in my Amazon basket and check the price each day until it drops to something I'm willing to pay. That's how I found this deal. But now I can't trust them at all!