I found no increase in speed after upgraded from NBN 50Mbps to NBN 200Mbps (NBN Cable Broadband Unlimited Superfast).
I have already received a comfiormation email on the plan upgrade completion and the new plan is already shown in my TPG account - NBN Cable Broadband Unlimited Superfast. Changres for the new plan has begun in invoice statement.
However, the Internet speed (reseults of various speed tests by Ookla, TPG customised etc.) remained similar to prior to my plan upgrade at: ~19Mbps/~50Mbps UP/DOWN. And this speed test is performed via cabled Ethernet. I am copy and pasting this from someone else in the community but I am facing the same problem and changing the parental controls is not helping me out.