My wife took her Volkswagen Polo back to the main dealers for a service, where she has always had it serviced since she bought it there. When she collected the car she noticed that the tailgate had a huge dent in it. She complained to the service manager who said it was already dented and had been marked on the walk round sheet. She argued that on Tuesday morning, when she took it for the service, it wasn't dented because she put her laptop bag in the boot and didn't see any damage. The service manager said he would get a quote for the damage and, as a goodwill gesture, he would pay half. He came back to us and said the car needs a complete new tailgate at a cost of £1200. I asked to look at the CCTV footage but he said they don't have any. We can't afford £600 to pay half the repair cost, especially as it isn't our fault. Where do we stand?