Read OneNZ terms & conditions about changing provider / notice period but I suspect you can kiss that $$ good bye 

EviLClouD:

 

Sorry me again.

 

Just received my One NZ bill on 24 Oct for the account and noticed I have charged full monthly plan cost.

 

It's for the period 8 Oct - 7 Nov.

 

I ported/left on 17 October.

 

Should this be pro-rata? Or would i get a pro-rata refund next month/bill?

 

It will show up next DOM (at least it should).

If you need confirmation you can just pop into a store(with photo ID) and asked for the unbilled amount which should be in the negative(credit).