New injectors for 5000,- Euro ??!!!

Hello ! Have a huge problem with my injectors on my 220 CDI: 3 injectors are coked. On request in the MB branch they told me that probably the cylinder head has to go with it, because it will probably be destroyed during the construction. Now I wanted to have the repair tautly carried out, then I got from the MB branch in Mannheim the next Jobs message, that with the cylinder head change also the crank case will go with it and also has to get out !!! That means: completely new exchange engine for 5000 Euro !!! My Vito already has a replacement motor with just 70,000 km. And on Kulanz also can not be true !?? Did you have similar experiences, and has someone a good tip for me ?! Best regards, Corsicabiker