insurance disappointment

I have always praised the caravan club to friends, family and on social media groups on how good they are. I have been a member for many years and have always used them for overseas bookings, European breakdown cover and insurance. But today I have had my mind changed drastically. I phoned the club insurance up to renew my insurance and in the process of doing this the advisor asked me if the van had been serviced to which I replied yes. He said can you prove this back 5 years and I said no as I have not owned the van for that long. He then told me that I would not be covered on the top insurance. This means that for the past few years I have been paying a premium rate on insurance that I would never have been covered for. Nowhere in my renewal documents does it state that the van needed to have a full service history all I got was a separate letter stating that the van will need servicing yearly not that it had to have full history. No example was given of what service is required weather it be a full service or just a chassis and brake service. SO BEWARE if you are paying for the full 5c  cover be sure you have a full service history and if you have purchased the van second hand this might be impossible as it was in my case. I will be seeking to purchase insurance somewhere else in future.