The NZ Herald headline is a bit misleading thou,

Most of the plans appear to be deprecated, and the price move simply brings them inline with their current mobile market offerings,  ($45,$65 )  

"One NZ raises mobile pricing by $5 per month, cites 24% bump in usage"

https://www.nzherald.co.nz/business/one-nz-raises-mobile-pricing-by-5-per-month-cites-24-bump-in-usage/LULCKO2NIVERVGACTNZBSHSMQU/

https://one.nz/planchanges/?srsltid=AfmBOoqK97bXFxsP3o3gUKD1vMUpqUyKXXBvpTgbo-mVUmpha407zbC6

• Red Share $29.99 – Open term
• Consumer Red Sharer Promo – 1 month
• $29 Plan – Open term
• $39 Plan – 24 months
• $39 Plan – Open term
• $59 Plan – Open term
• Advantage Lite – SIMO
• Advantage – 1 month
• On Account Connect – 1 month
• Red Lite – 1 month
• Red+ Lite – SIMO
• Red – 1 month
• Red+ – 24 month term
• Red+ Essentials – SIMO
• Red+ Essentials – BYO smartphone – Open term
• Red Essentials – SIMO