very pissed off right now

I am not sure how to deal with the situation that has come up. I went through fall rush knowing a lot of girls excited because I knew this semester would be it. I attended every event and was super excited. I had to miss a day of rush due to class but according to my school you only have to attend the two other days to be eligible for a bid or invite. I went to pick up my invite and was told I was not eligible of which I KNOW i am. I checked my gpa and attended all the events I was told to. This has happened to at least five other girls I know had the same exact thing happen to them . Sorority Sisters are complaining to the Greek Life Office that this is a mistake But she just won't budge and told me I will have to COB i don't know what to do seeing as this isn't my mistake