New Zealand Law
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You can make an application to the Tenancy Tribunal to get a work order to force him to make the repairs. You could also ask for a reduction in the rent from the Tribunal because of the failure to get this done costing you much more for the power. You can make an application to the Tribunal at this site
http://www.tenancy.govt.nz/disputes/ Have a look at the site and if you have further questions please ask here. They will help you resolve this.