I bought a 2014 Volkswagen Tiguan with a full service history from a main dealer. On taking delivery of the vehicle I started to clean it and noticed in the boot under the polystyrene liner was rusty, which came from four drilled holes. Something had obviously been bolted in by the previous owner and then removed, resulting in water ingress from the underside. I contacted the dealer who inspected it and told me they would need the car back to rectify it. I was told by the service manager a new boot floor had been fitted, but on delivery I noticed that all they had done was filled it with filler, rubbed it down and sprayed it. I reported it back to them as they delivered the car to me. They had it for 10 days and it came back in a filthy condition. I am within my 30 days money back guarantee. Should I return it to them for a full refund or should I ask them to source another vehicle or should I have it repaired myself and send them the bill?