Please forward your feedback to the forum software's developers, it's their software that is not performing correctly to block the automated spam bot programs.
The problem will be solved (hopefully!) when version 3 of the phpBB is released officially, it's currently in RC stage of developement.
We have support staff working in two different time zones at the moment 4 to 6 hours every day but it simply sometimes take a while to get the spam messages removed. We will be increasing the size of our support staff within the next few months.