It is possible that you are in New Zealand illegally, e.g. you do not have a valid visa, or, incorrect travel conditions.
When this occurs you become automatically an over-stayer. This is a serious offence and therefore should not be taken lightly as it may result in deportation from New Zealand with an automatic ban for 5 years.
Under certain conditions you may be able to lodge an application subject to Section 61 (and Section 11) of the Immigration Act 2009.
Please contact TNC for more information