Hi, I'm currently on a TPG NBN Broadband XL Bundle 100/40 but out of contract.  This is costing me $99.95 / month. I see that the NBN 100 is now $79.99 for first 6 months and then $89.99 thereafter. How do I re-contract to this lower rate, what additional charges apply and when will billing take effect.   Thanks ... View more