New Zealand Law
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I think unless they have sensible answer to your query, then you should refuse. If they forgot a fee which has been charged and which was omitted on the first invoice, then they should say so and not reinvoice like this.
So unless they admit a mistake or an omission, then you can refuse to pay.
Even if there is a mistake or omission, then you can certainly argue that payment of the first invoice discharged your obligations.
Thank you - that is what I felt about it.