It's not a 'complaint' you can close like for example an official PAB. It's an informational thread describing your issues with Gday to which many have responded. You can't 'un-ring a bell'.
The general consensus here is that whilst members don't particularly approve of the 'discretionary' nature of the term in question, the term was nevertheless valid and you were subject to it. Remember most casinos nowadays do have a bonus conversion or cash-out limit, not just this group.
So as I understand it, they haven't stuck rigidly to the 5k limit in your case and have offered 3 times as much which you have decided to accept as settlement of the dispute. Given the information in this thread and the fact you have seen arbitration services elsewhere support the casino in this kind of issue, that is probably a decent outcome for you.
So as far as you are concerned the matter is closed and the dispute over.
If you want some sort of admin statement added here to cement the above, you're better advised to contact maxd who can provide his summary and close the thread as he is the 'beefmeister' on here.