Oh, my, Ones44. I am so sorry this policy has led to possible expulsion. I hope your meeting with the dean will go well. Your school is not the only one that has instituted strict attendance requirements.
However, it sure sounds like your school does a poor job of informing students about things. How did they try to do it? Snail mail or e-mail?
The schools my sons go to seem to keep us parents out of the loop, since my sons are over 18. But I can see the school contacting parents in a case like this one. Too bad your parents aren't understanding.
Hang in here. And please keep us informed.