Sorry I didn't see this earlier. The Patriot Club is basically the fundraising arm for all of Mason sports. All of the facility upgrades, all of the private money that a sport gets usually gets facilitated through them. If you want more specifics let me know, or take a look at their website.
I had a little bit of bad luck with it too. I think it was more Ticketmaster than MAson though because that is who manages the ticket portal. If you go here, https://am.ticketmaster.com/gmu/2122MBBDEP#/ add the tickets you want and follow the prompts you should be good to go. That said I of course tried it and got an error so I suspect something is down with Ticketmaster.
If you get very impatient call Taylor Bosket at (703) 993-4112 and he will help you out.