Complain to Immigration New Zealand
Using Immigration NZ's internal complaint process
It is possible to make a complaint if the correct process was not followed by Immigration NZ.
Have your case heard and provide feedback
If you believe that the process followed by Immigration New Zealand has not been fair or that the decision is not correct, you may look at lodging a complaint to Immigration New Zealand.
You will need to have a good understanding of the immigration instruction (operation manual) and the relevant processes to be able to put together a good submission.
If you need to lodge a complaint to Immigration New Zealand, it would be advisable to seek professional assistance.