Welcome to the Community @paulrohit2002
For customers experiencing any issues with their NBN service, we recommend the best thing to do first is check if there's an outage on the NBN network.
We have created this article that can guide you on How to Check for NBN Network Outage
If there are no known outages in your area, customers can proceed with the troubleshooting steps indicated on this link : https://www.tpg.com.au/support/nbn-hfc-cable/problems_connect_internet_nbn_hfc
In your case, we have lodged the issue with NBN Co due to a faulty NBN NTD box. They've booked an NBN technician that will replace the equipment to resolve the issue.
Your assigned Engineer will be in touch with you for further updates.