We apologise for the inconvenience this issue is causing you, @jhin.
We will make another follow up and will have the case engineer contact you as soon as the TPG technician schedule becomes available.
Hi @jhin, we can see that the case engineer has been in touch and advised you that another NBN Technician has been booked to investigate further.
We are still monitoring your case and please let us know should you have further queries. Thank you.