Welcome to the Community!
We have checked the status of your connection and we are detecting a line fault which is possibly causing the issue.
That being said, we'll have a specialist contact you on the mobile number we have on file for assistance.
If you have a preferred contact number and available time to receive a call, please send it via private message. Thank you.
Hi @6pengliu, we can see that our Technical Team has been in touch and the issue has been escalated to our Engineering Team for investigation.
The Team lodged the case to Telstra and a technician was booked to check the line anytime between now and 09/May/2018 and your attendance is not required.
The case engineer is monitoring the case and will be in touch via SMS or a phone to provide additional updates.
Should you require any assistance, please let us know. Thank you.