New Zealand Law
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It is the local noise control officers at your council who are the ones with the power to help, and the police generally defer to them. It is unfortyunate that they have not been effective so far but you will need to keep at them to help you. They can dothings like confiscate stereo equipment and the police can intervene if this becomes unruly. So perhaps going to a more senior level in the council, or contacting the Mayor may be your nest steps if the officers are not helping. With regard to the landlord. I would suggest you tell him he must keep his tenants under control, or you will sue him for the civil remedy of nuisance caused by his tenants. If he thinks you are bluffing, then you could start a court case against him, and you have some good evidence from both the noise control complaints and the negative review. which would help with damages. However a lawyers letter may make him take notice before you need to actually sue him.
I hope both the council and the landlord now step up and help.