SF class and damage is taken over

Hello! Here’s what happened: My father had a small damage to the SF class 30 and unfortunately in 2013 and was reclassified to SF20. I don’t know any more, 100% exact figures. He could not drive at the time (2013) for health reasons, shut down the insurance and now my wife was able to take over the SF class. A new car was registered, for the first time in your name. Since she has only had her driver’s license since 12/2001, she can stay for a maximum of 11 years. chnen. Why only 11 is also a question but that would still be good. Now the insurance all at once said that there is a damage and therefore the taken SF is reduced to SF5. And zack, it is just 250€ more per year. The damage has already created a reclassification. So why again? And of course I only learn about it when I had called today to ask what is with the invoice. The whole thing is now no longer in the revocation. Umd of course wur wur I think that is absolutely unfair! Greetings Marco