The $400 off an S20 at 2degrees, do the terms mean you can cancel near immediately, keep the saving and just repay the balance, because the TnCs do not mention the $400 saving......
https://www.2degreesmobile.co.nz/mobile/samsung/s20-ultra?gclid=EAIaIQobChMIm8Kcibyt6QIVQdeWCh2MNwLPEAAYAiAAEgI_3vD_BwE
"Saving: $400 savings available when you purchase a S20 Ultra or S20+ outright or interest free on a $40+ Pay Monthly plan. If purchased Interest Free: Phone balance repayable if you end your eligible plan."