Yeah I know that I am on the right side but the problem is that prefecture says that my parents need Type D visa. How shall I convince them? I showed them the EU directive but they don't agree. What shall be my next step?

I am a UK Citizen living and working in France for the last 2 years. My parents are non-EU citizens who are dependant on the money I send them regularly. They are coming to France on a short stay type C visit visa. I want to apply for French residence card (carte de sejour) for my parents. I contact...