Hi @hsalim3006,
As per our phone conversation you are on our own high speed TPG FTTB product.
This product give you better speed and value compared to the NBN 100 plan as per below comparison.
NOTE: You can ignore any letter's sent from NBN saying that you will loose your service if you don't go to the NBN as our TPG Fibre to the building runs on our own high speed fibre network.
Cheers
Manuel