Hi All,
I'm going to attempt to avoid this becoming a rant/soapbox but I suspect some might view it this way. I don't have any bad blood towards One NZ - the service was rock solid for many years whilst I was in NZ and continued to be rock solid afterwards... this was purely a pricing affair.
The TLDR:
- When leaving One NZ, future date your transfer of service.
- Double check the email that they send you once the transfer has completed.
- Double check your bill.
- If you get pushback from the customer care person, ask for it to be escalated as a formal complaint.
I've had two instances of this occurring where One NZ has gotten it wrong. I have transferred two services to Quic (using the Geekzone affiliate link) and had deliberately post-dated the transfer of service to allow for 30 days of notice. Quic is awesome where they allow you to see the orders that they've lodged with Chorus, so I know that the right dates had been set.

This is in line with One NZ's FAQ (https://one.nz/help/my-one-nz/cancel-an-account/):

On the days of transfer, I got the following emails (I've only included the interesting portion):

When I reached out to One NZ customer care via iMessage and whilst the customer care person was polite and friendly, I found that the '30 days notice starts from the time the service is disconnected' inconsistent with One NZ's policies.

Ultimately this was escalated as a formal complaint with the complaints team advising that the first customer person had credited the first notice period and the complaints team crediting the second notice period. So ultimately a fair outcome... but a journey one shouldn't undertake.
I don't think my scenario was particularly exotic, so wanting to put it out there.
I also note that some of their MVNO's - namely Kogan (from first hand experience) did not allow me to nominate a future date (therefore an ASAP port) which makes it very difficult to avoid running into One NZ's 30 day notice period when coming from On Account / Post Paid.
