i think i got dirty rushed

You can report it to Panhellenic. Depending on how long ago it was, it may not matter but always worth trying. Do keep in mind they will likely make excuses. They tell the sisters not to say those things but they can't control what every single person says.

Don't know what house, but really that just means "once SOMEONE joins ()" not once YOU in particular join. It's just semantics, and the way everyone talks in rush. Unless there are other circumstances, this would be hard to prove as purposeful dirty rushing. If you don't report it immediately and then they drop you it kind of just looks like revenge. If this was your number one house, it really does hurt to get dropped, but there's nothing you did wrong, or could have done to change the situation, whether this person actually dirty rushed you or not. Please try to let this go; you're not going to find satisfaction.