I don’t think it’s as straight forward as that.
By-Laws apply to owners and occupants, and Owners Corporations are held responsible to properly manage and maintain their Common Property (like entry doors), so what came first in terms of the entry door slamming, the chicken or the egg?
Is it that the door cannot be closed quietly, or is it that “owners and occupants” of the building are allowing it to slam and to thereby interfere with Matt’s peaceful enjoyment?
So rather than pursuing a possibly fruitless route down the mediation path, I’m inclined to KWP’s suggestion – so try contacting your Property Manager (Rental Agent) in the first instance so that they can make the Owner / Landlord aware of the problem and who/what’s causing it (if you can name names), and so that they can follow-up with their Owners Corporation.
OK, so that route may be longer, but at least it may lead you to a solution.