You could try manually configuring your modem. Please see https://community.tpg.com.au/t5/Modems-and-Devices/How-to-set-up-your-TP-Link-TD-W9970-modem-for-ADS...
Your username and network password should be on an email with TPG.
Thanks Brett. I have gone through all steps to manually configure the modem and still no change.
I did notice in the settings under Network > WAN settings, is ways the DSL link is NOT active.
Do you have only the one outlet in your house? If there's another, try the router in it.
If you are using a filter/splitter, remove it since it is only needed for phone.
Telstra can't properly test the line until they check up to the network boundary, usually the first outlet in your house. You might call Telstra again and say no-one has been to your house to check the line.
See how you go.
We only have the one outlet in our apartment unfortunately, and we're not using a splitter
Do you know how I would get in touch with Telstra to check the network boundary? Have been going through TPG support so far and not having much success...
Are you in a house or villa?
You might look around outside to find a pit right next to the house. This is where the phone line comes in from the street. It appears the network boundary is in the pit (Telstra documentation, but it depends on who you read), but a Telstra technician may still check the phone outlet inside as well.
So, you could ring Telstra 132203, tell your story (ADSL connection, router not connecting, single phone outlet without phone service, need phone line checked up to network boundary). If they accept that, they may say there will be a charge if no fault is found.
There may still be something wrong between the pit and your socket. You could take off the front of the socket and see that the two wires are properly connected to the terminals. Otherwise you need a "licensed cabler" to check from the pit to the socket.