Professor switched Final date and didn't notify me. (Repost from r/college)

I go to UIUC, and our final was scheduled to be Dec 17 (tomorrow) morning. I just read an announcement that was posted yesterday (Dec 15) at 12:45pm by the TA that the final was scheduled for Dec 15th at 1:30pm. The syllabus says we would be notified of a final exam schedule change by midway through the semester, and it was never mentioned in class or put on the class website anytime throughout the semester. So apparently I missed the exam and now have a 42%, and have obviously missed the conflict exam submission date (Dec 5). I just emailed the professor, but I am wondering if there are any other steps to take. I'm not sure if any other students had this problem as well, but I have been very careful and thorough in making sure I don't miss dates for exams because I need these credits. Any recommendations?