https://www.kogan.com/nz/kogan-mobile/?deals_from=kogan&page=1&price=250 

The unique Kogan Mobile voucher included as part of this product is non transferrable and cannot be redeemed for cash. Voucher must be purchased before 11:59PM NZDT on 07/01/2024. Voucher must be redeemed before 11:59PM NZDT on 31/01/2024. A Kogan Mobile SIM card is automatically included with a purchase of this plan. SIM delivery takes up to 14 working days, after which you can activate your plan. Activation or recharge must be made before the voucher expiry date. Voucher does not apply to subsequent recharges. Voucher cannot be used in conjunction with any other vouchers or promotional offers.