Cast control chain at G.Punto 1,3 Multij.

Hello, with my Grande Punto 1.3 Multij. Year of construction 8.2007(new car) the control chain has torn at km 150000. Despite regular inspection all 30000Km Fiat does not want to participate in the damage Kulanter wisely.(Rep.Costs according to workshop approx.6200Euro) Somehow I do not see this at all. The car cost new 17519,00Euro and does not hold even 3 years, that is for a diesel after all, right? Unfortunately the warranty has expired after 2 years. My question: Do you have to Is there any way to resist it? Greetings from Cologne and thanks for the help, Jörg