Much easier if it’s within 30 days of collection. I rejected mine on day 30 and received a refund from Eurovans. To start with they advised that the extended warranty could not be refunded, but VW customer service called them and suddenly they could!!
In my opinion, I think Eurovans could be more sympathetic and even honest in their attitude to owners with leaking bellows. Every time I asked them about it, the response was that they only had 3 Californias that leaked and one of them turned out to be a problem with a window rather than the roof, apparently. One of those Calis was mine and I know of more than one person on this forum who has complained to them with evidence that their bellows leak. Their numbers don’t add up.