Hi @Molly
Welcome to the Community!
We were able to locate your account using your community details and understand that you've been in touch with our Tech team. They've tested the line and was not able to detect any fault within the NBN network.
They've guided you with the troubleshooting and using another device, you were able to get a good speed test result with 25Mbps Download and 4.9Mbps Upload.
You may also check the article that we've created to troubleshoot a slow speed issue. Here's the link.
BasilDV
