Hello!
Unfortunately immigrant office denied your visa. That was because they realised that you are going to work here, not to be just as a member of our family, which they think should be the meaning of being au pair. Next we have to find out if you should come here with a tourist visa. We get back to this during this weekend. The decision was bad news, but we keep working on this. If this ends with no luck, we help you with the 425 euros you paid.
Ville