We're sorry to hear if you feel that way about the arris device.
You can follow this set up guide on how to set up your connection using your TP link device on a HFC network.
NBN HFC Setup - General Setup
How to set up your TP-Link VR1600v modem
Let us know if you need further assistance.
This is just a follow up to the question you've raised.
I checked the TP-Link TC 7650 modem you've mentioned which is a DOCSIS 3.0 cable modem. Are you trying to replace the Arris cable box with it? Because you can't since that equipment is owned by NBNCo and you need to use the NBN-installed equipment for the NBN-HFC service to work.