If you want to query a notice youai??i??ve received, your first point of contact should be your ISP.
If it all seems like something from another planet, then you can try ringing Netsafe first on 0508 NETSAFE (6387233) or send an email to email@example.com, and they can advise you on what your options are.
Be aware that you might receive emails which look like notices but are SPAM. Take the usual precautions you would usually take with any email – donai??i??t click on links, and if you are in doubt as to whether the notice is legitimate, call your ISP to check.