Welcome to the community!
Usually the speed of the service will change after 15-30mins, is the speed is still the same? If so, try to perform a reboot on the modem/router for 3-5mins and let us know how it will go.
So thanks to one of the mods I got my request approved to now be on nbn 50.
Just wondering now how long it will take for the new speeds to be undertook. I tested my speed and it's still what I normally get.