I have no idea but lawyers provide free consultations for these things. They work on commission typically, so they want you have to a strong case. I would speak to you and see if you have a case. Right now though, nothing has happened and you have no case. Let the company dig their own hole or laugh it off with you. Don't give anyone any ammunition against you. If the IT guy, your manager, external contractors, etc. catch any flak for what happened they'll redirect the blame to you. Just hold your ground and don't yell or get angry.

I also think it's possible you're blowing this up out of proportion and you being a temp would explain why your coworkers didn't have your back. If they're set on firing you, just make sure they throw you some money for the hassle. Is it possible it's not a big deal? It is all kind of ridiculous after all.