I need help with my first nbnᵀᴹ bill

The nbnᵀᴹ billing period is from the first to the last day of the month. On your first bill, you will have a prorated charge from your activation date to the end of that month, and also your first full month in advance. The upfront payment that you made at sign up will be deducted from this total amount.

For example, if I order the Superfast nbnᵀᴹ plan at $98/mth on the 11th of March, then I will pay $98 at the time of ordering. Say my nbnᵀᴹ is then activated by Goodtel on the 15th of March. I will receive my first nbnᵀᴹ bill in the first week of April, which will be for the period of 15th of March to 31st March and also one month in advance from 1st of April to the 30th of April. The $98 payment I made on sign up will be deducted from the total bill amount. All subsequent bills will be sent in the first week of the month for the period of that month.