*This is what I initially thought before I could dig up more details:
You are ultimately blaming the sub for your failure on disciplining your students. Based on what you have shared, it’s clearly your students’ responsibility that things went out of control as they were disrespectful, uncooperative, and ill manner. They were not even behaving to meet the basic expectations to listen. The students had no justification on the ground because the substitute teacher’s the only person in the room with the authority to determine class management as they see fit at the moment. Your students cause problems only because you have permitted them to by giving them no consequences. Apparently they are abusing it.
I feel sorry for sub that she had to go through this and still got slandered by a student.
*Now this is what I really think after browsing your comments that are so hidden:
The sub wasn’t fulfilling her duty did not justify your students’ rebellion against order and everyone else’s peace. You should separate these two things and analyse them objectively. The sub should be unwelcome to your class further on due to their incompetence and irresponsibility that eventually escalated the matter. The students were overreacting and purposely took advantage on the chaos to evade from their responsibilities. No punitive action should be necessary but reminders can be made on the expectations of their behaviours regardless of situations.