@Jasen96
NBN has nothing to do with a smart meter and you should note this.
Is your Usage increasing but not your solar it is more likely that you are having overcast days and not EXPORTING but consuming your solar generation.
Yesterday (17th) I generated 28.2 kWh and AGL reported I exported 24.808 kWh, on the 7th I generated 14.4 kWh and exported 10.985 kWh.
Have you checked your solar system to make sure it is working, look at the solar system inverter and check that it is working.
AGL only receives the data that your meter sends.....
Cheers Neil
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