You would probably need evidence of what happened to you when you went back because I'm not sure INZ would just take your word for it, if this happened to you when you went back then what is happening to your family who are still there? Plus if they come to the conclusion that your home country can provide a means of protection good enough to keep you safe they will not grant refugee status.
I am no expert but have read a little about becoming a refugee in NZ. This is probably not the answer you want to hear but based on what you have said I think your chances are slim