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Hi @Gavin
Welcome to the Community!
Thanks for raising this with us. I can only imagine how frustrating your experience has been.
Using your community details, I was able to pull up your account. A Telstra technician checked your line yesterday and has made a fix. Our current test results no longer show any evident line fault.
I can also see that you've spoken to one of our Technical Support team earlier today wherein you were informed of a possible internal issue affecting your service still.
Nonetheless, I have requested for our Engineering team to contact you before 3:30PM NSW today using your mobile number we have on file. If you need to provide us a different contact number or change the call back schedule, send me a PM. For your reference, you may visit this link: How do I private message (PM) in the community.
Regards,