Thanks for raising this to us, we're able to locate the account using your community details and ran initial test. The result shows getting a passing speed on the line, no dropouts were reported. The 12.55Mbps you're getting with the speed test is considered passing speed since the service plan is on NBN12.
If you wish to get a faster speed we recommend to upgrade the NBN plan and it's free. For more details please see link below.
