I'm getting ISS tomorrow and the next for "yelling" at a girl

i got f**king DAEP (more strict ISS) for a false rumor that my ex made up bc i broke up with her. the rumor was based on a call of duty meme i never even showed her

Me and my classmates from weightlifting class we were knocking on the door and then I saw this girl I thought was gonna open the door and let us in. BUT NO. and finally someone (who wasn't her) opened the door. then I saw her and said "I know you saw us" then after lunch, I saw her again and said the same thing but a little louder (she was shorter then me (and the reason I'm adding that is because apparently I was intimidating her))