Records, records, records. Phone conversations you had with service advisers, detailed notes of anything a mechanic told you, EVERYTHING you can possibly imagine. I sued VW under the Lemon Law back in the 1990's and they denied everything right up until just hours before we headed to court - then all of a sudden they took the car, paid all my lawyers fees, and gave me back my purchase price. But it took nearly 1.5 years to get to that point, and at first they said there was nothing wrong, then they started giving me offers like "we will give you $5000 but we get the car"...well, where would that have left me?

All I can say is keep every piece of paper you thought you did not need, and it will make your life easier. As for "you are likely entitled to a refund or replacement car from the manufacturer" - though we might be entitled, they don't just give us new cars or our money back. It's a big fight!