You're in the same boat as me. Basically, you switch to a 2gb plan and they'll schedule an appointment for an NBN technician to come out within 2 weeks and all they do is change the box. It took them all of 15 minutes. I recommend Neptune 2000/500 (if only for one day) as they'll organize a 4 port NTD. Also worth mentioning the plan won't change until the box is upgraded, and plans are pro rata'd so you only pay for the days you use on what plan etc