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Hi @itisniranjan,
For customers experiencing any issues with their service, we recommend the best thing to do first is check if there's an outage affecting the network.
Check our Service Status at http://www.tpg.com.au/servicestatus for any known outages.
If there are no known outages in your area, you can proceed with the troubleshooting steps indicated on this link : https://www.tpg.com.au/support/problems_connect_internet_fttb_bundle.php
In your case, a TPG technician has been booked to rectify the issue.