Note that it says you must be the parent or guardian of a kid who is 6-18 years old on the 31st December 2018 to enter.

The promotional period begins on Wednesday, 13 June 2018 and finishes on Tuesday, 10 July 2018. Online entries must be completed by 11.59pm Tuesday, 17 July 2018 (Entry Deadline). All prizes will be drawn on 20 July 2018.
Enter the draw to win 1 of 3 Basketball Hoop Sets (each set comes with 4 basketballs) when you purchase any Milo beverage (900g tin, 700g pack or 6 pack RTD), excludes Cereal.
To enter the competition you must, during the promotional period:
  • Purchase any (Milo 900g tin, Milo 700g pack or Milo 6 pack Ready-To-Drink), excludes Milo Cereal at any The Warehouse store or online; and
  • Complete the online entry form at www.thewarehouse.co.nz/competitions, including entering your name, phone number, and the unique alphanumeric code/DK Number from your The Warehouse till receipt or Online Order Confirmation number.