Welcome to the Community!
Thank you for raising this with us. Using your community details as reference, I was able to check your the information regarding your NBN order. From what I can tell, NBNCo has classified the order as Service Class 33 which means that the line infrastructure has been laid out already. The only thing required by NBNCo for the service to be activated is for the NBN Connection Device and modem to be plugged in from your end, hence, the reason for the notification you received. Though it was unfortunate that it didn't work the way we hoped for it to be, it was necessary to connect those devices to determine if the service will get activated or if it will require further investigation from NBN.
In theory, your ADSL connection should still work at this point since the NBN service wasn't activated yet. If your ADSL account is still active, I would suggest checking with their support to see the status from their end.
I can see that our Provisioning Team has requested for a TPG technician to check the connection of your devices (NBN box and modem). You will be notified via SMS or call once the appointment schedule is available.
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