Mercury NZ complaint?

Do you have a dispute or a bad customer experience with Mercury NZ? Report it through our website to maximize the chance of getting it resolved.

We help you write an effective complaint in minutes. Our AI models are trained on thousands of effective complaint letters. Then we push it through emails, social media, paper complaint letters and other tools at our disposal. And you are not alone: our helpful community is there for advice.

Mercury NZ customer service is on 0800 10 18 10. For a complaint, Mercury's website has a dedicated complaints page, and Mercury publishes a complaints email address, shown with its other contact details on this page. Have your account number, the ICP number from your bill for electricity, and the dates and amounts in question ready.

Bill higher than expected or a payment taken twice? Start your complaint here and we push it out to Mercury by email, social media and printed letters.

To dispute a Mercury NZ power bill, check first whether the bill used an actual or an estimated meter reading. Take a dated photo of your meter, compare it with the reading on the bill, and tell Mercury in writing which billing period you dispute, what reading you believe is right and what you want corrected. Ask Mercury to confirm in writing how it will treat the disputed amount while it checks.

Keep the bills, the meter photos, bank statements and every email or chat reply in one place.

High bill based on an estimated reading? Our trained AI opens a case for you and keeps coaching: what to send Mercury, when to push again, and how to escalate inside the company.

To escalate a complaint with Mercury NZ, put it in writing to the complaints email shown on this page or through the complaints page on Mercury's website, and say clearly that you are making a formal complaint. Include your account number, the ICP number for electricity, a short timeline of what happened and what you want Mercury to do, and ask for a reference number.

Mercury NZ Limited's registered office is in Newmarket, Auckland, but customer correspondence goes to a separate postal address in Tauranga, so use the complaints route rather than the head office address.

Yes: Mercury is a member of Utilities Disputes, the independent dispute resolution scheme in New Zealand for complaints about electricity, gas and broadband from member providers, though not complaints only about the price set. It generally expects Mercury NZ to have had the chance to put things right first, so keep a record of every call, email and letter with Mercury about the problem.

Raise it through our complaint process and we help you write it in minutes, with the bills and meter readings set out in order.

Nothing has been reported about Mercury NZ here yet. Our research shows what typically goes wrong at energy and broadband retailers: bills that jump after estimated meter readings, direct debit amounts that change unexpectedly, final bills after moving house or switching retailer, broadband faults that take time to fix, and disconnection warnings during a payment arrangement.

Final bill bigger than you expected after a move? Report the first case here, and it opens the record for the next Mercury household facing the same bill.

Your complaint gets its own public page on Complain.biz and we get to work: we bring it to the attention of Mercury NZ through emails, social media, paper complaint letters and other tools at our disposal.

And we stay with it after you file. Our trained AI opens a case file for you and keeps coaching: what to reply, when to push again, and how to escalate if nothing happens.

Yes. We have an active community of consumers, and complaints here are public: people who ran into the same problem with Mercury NZ can give you advice or back you up with their own story. A complaint with a community behind it is much harder to overlook.