Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
You need to have the car inspected by an A/C specialist or at least somebody you will inspect the A/C system.
I would bet you have a low gas charge, and now the compressor is not operating.
The leak would be obvious, even possibly to the untrained eye.
The light doesn't operate at that point either.
I would also think about using another mechanic, if he says there is nothing wrong.
VE Commodore has many problems with A/C, all are resolvable, when you know the cause.
Hope this helps.