all 4 of my wheels were corroded around the center caps and they tried to tell me kerbing had caused it (how you can kerb a wheel around all 4 center caps I don't know!), then it was the wheel cleaner that I was using, at which I told them I had bought it from my local dealer. In the end after nearly 9 months, lots of phone calls, lots of emails, lots of letters and help fom the local dealership got them sorted for me!!!
VW UK are rubbish to be kind.
2 weeks after getting the new ones on my wife felt and bang when parking on a side street, got out and saw a bolt sticking out from the kerb stone (looked like a bad repair from council!!), so took photo's and got a claim going through at council insurance now!!