Hi and welcome. It’s possible that the microswitch in your gear selector is faulty - its a somewhat common issue on the automatic Golfs and basically what happens is the car doesn’t realise that its in Park and therefore wont start.
The microswitch can be replaced, assuming that is the problem.
Where abouts in Melbourne are you? Should be able to recommend a good VW mechanic if we know what are of the city you are in?
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