IMO you were hired by the pro. Their payment to you, exactly what you asked for, experience.
You owe it to the pro to present your photos and the brides request and let them close the deal. Then ask if you can do it again and negotiate your compensation for the next time.
Ask yourself how easy it will be for you to get a paying gig on your own. How easy was it to get work through this pro? I've known Wedding photogs that worked for others (with high end reputation) and themselves. If you contacted them and asked them to do the work you got them at their price. If you asked them about the much well known company you got the same photog but paid the much higher price. Sometimes the high end company would call them and ask them to assist on or take over a shoot. It's a way to get started but you have to play nice.
Just the cost of hiring a good lawyer ($300/h) or a even a bad lawyer ($100/h) is not worth it.
Not sure if they have small claims court down under but they do here and there are no lawyers. The limit is like $10,000 and I think that would be a really good day for most wedding photogs.