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Hi @alexCao,
Welcome to TPG Community!
We have located the account using your community details. We can see that your concern has been escalated to our Engineering Team.
As per checking, your service is currently affected by a Telstra Network Outage and Telstra will aim to restore the service anytime between now and 27/Feb/2020.
Our Engineering Team is closely monitoring this and will contact you for any additional update.
We sincerely apologise for the inconvenience.