The earlier cars had an issue with the cam chain tensioner, my car had anew engine at around 45000 miles under warranty. If that's the issue you need to pester vw as its a known fault and keep pestering them for the issue to be sorted, most likely with a new engine, tell them its down to their incompetence for designing and selling sub standard cars which are incapable of basic function. Stuff like that, i know the warranty is long gone but its not failed because of misuse, age or wear. It has failed due to being defective.
If that is the issue remember.
