New Zealand Law
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Once the contract is awarded there is nothing further which you can do to obtain the contract yourself, or challenge e decision. In construction law it is well established that the award of a tendered contract is very difficult to overturn. So while you could get a determination to disprove what they have said, it won't then help you overturn the decision to give this to someone else.
You can get rulings from MBIE as I think you are aware and the contacts are:-
If you’re unsure whether applying for a determination is your best option, contact the Determinations Team for further information on 0800 242 243, or email *****@******.***.
NZS 3910 will not however give a remedy because this provides for rememdies when you have a contract, and as you didnt get one after the tender, this wont apply. But this can also be a political issue, and if you geta determination about the faulty reasoning you can ask councillors to ask questions, or even possible Audit NZ if you think the council is not applying appropriate reasoning