Same problem. Extremely slow upload speed on NBN - 0.08 Mbps. It takes me an hour to make 300K email attachment, if I am lucky enough to successfully make it at all. Upload speed was quite ok for a few years, but dropped drastically last month. I am on 300 GB NBN contract (DSL).
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Thanks for providing your account details and the speedtest result via PM.
Based on the screenshot you provided, it looks like the main issue is on the Upload speed. We performed tests and the upload speed that the modem detected was actually 25Mbps. So it looks like there's something off between the transfer of data from your modem to your devices.
We have refreshed your connection to see if that will improve your connection speed. Can you run a test and let us know how it goes?