The Internet root servers show that hosting4life.nl is at 212.204.224.103, and that the name servers for it are ns and ns2.cueball.nl.
Did you register your new nameservers with your registry (the place where you registered hosting4life.nl)?
Did you tell the registry they should use your new nameservers?
DNS is a distributed database that starts at the root servers, so you must do both.
Jeff