Welcome to the Community!
Thanks for raising this with us. I performed line tests and based on the results, we're indeed detecting a line fault that may need to be raised to Telstra for repair. For assistance, I have escalated this issue to our Engineering Team, You will be contacted via SMS or phone call within 24 hours for the updates.
For other queries or concerns, feel free to leave a comment.
I can see that you have already spoken to one of our Engineers earlier. From what I can tell, this has been raised to Telstra already. Please wait for additional update as to when a Telstra technician can check your line. You will be notified via SMS or phone call.