Nope but feel free to pick one "tooth fairy" to write to though I doubt they'll do much seeing how Amazing probably hasn't broken the law (perhaps pushing it will be informed consent). But anyway, there's contestant no:
1. Singapore Sports Council
SSC has a figurative hand over water sports though they don't have a purveyance over the legality of how DCs run their businesses
2. Singapore Underwater Federation
SUF might be what you're thinking of looking for but their last active business on their website is a legal memo of their meeting minutes circa 6 months ago. Both of which I've no interest to write to nor deal with.
This seems to be a sport where a bottoms up approach is much more meaningful to advocating change seeing how divers are frequently dive outside of SG, their top-down purveyance ends once we cross the customs or international air space. You want a meaningful change, write to the DC in question instead and tell them you're very very cross they "bluff" people and you'll not eat Babi guling until they reply you.
Or you can do what I do, just avoid them like a plague and tell people around you to avoid them for this stupid deal just to deprive them of my small small earthworm contributions to their misguided business model. Once in a while, shoot them a dirty look if you spot them on the boat and spit in their general direction (mental note to remember to spit at my DM friend).