Interesting thread.
To sum up, you're in Rez (at dorm, campus housing...whatever the kids call it these days) and the University provided internet is blocking your online connection for your console.
You've asked about this and they said "No go"
The university is of course well within its rights to offer as much, or as little access, for free, as they see fit.
Your options are (Based on what has been said here) and in the order I'd consider them (if I was in your shoes).
1) Purchase your own internet from an off campus ISP. Honestly I don't even know if this is an option, their might be rules about who's allowed to provide Internet service on campus and in student housing. But check into it. This option might cost you 10-30 bucks a month, but it might be the easiest. And you might be able to share the expense with others.
2) Appeal to those in charge. I think you spoke to a dude on the help desk, he's bottom of the ladder, he spewed policy as he knows it, at you and was looking to get back to his Cheetos.
As suggested round up some like minded folks and ask some consideration from someone who can actually make the change you want, or move your request up the ladder. If you are willing to pay a little extra for it that might help things along. Imagine offering 30 people willing to pay an extra 10 bucks a month so they can game, and all they really have to do is just allow some access.
Also what about whoever runs the place you're staying at for the University? Or the Student Union/government? You have a reasonable request, and (likely) others who also want it, and if you're even willing to pay a reasonable price for this additional service, and you're denied making your own alternatives, then the student union should be there for you!.
Or (if option 1 was a bust) ask if some accomodation can be reached for going to an outside provider (and if you have 20 or 30 people who are with you, perhaps one dorm can be wired with unrestricted internet you all pay into in order to do this)
3) Move off campus so you can have your own internet. Likely off campus houseing will cost way more than what you pay oncampus, no idea if this is feasible for you or not.
4) If all of the previous options are a bust, you have been offered some options (on this thread) to try and sneak your console online (Some more dubious than others). Of course if its just the MAC ID, have you tried using a router to hook your console up to?
Of course circumventing network security may not be something you want to risk (As I recall, University's can be pretty petty when you break their rules, because as a student walking away is pretty difficult).
Hope this helps some!
I would be very interested in finding out how this turns out for you!