Can A Lecturer Actually Do This?

I was in afternoon class yesterday when my biro stopped working, so i decided to go and collect the biro I gave to my friend before the lecture. I stood up and went to the where my friend was sitting meanwhile the lecturer was in at the back of the class receiving call. I thought to my self that I would collect the biro and explain the reason for my standing up to him but before I could do that; he called me and asked me the reason I stood up, I explained to him and he said I should get out of his class. Before I could reach the door he asked me to come back and give him my name and matric no; which I did, then he sent me outside and said I should never come for any of his other lectures or test. He conducted a test for us that same evening which true to his instructions I didn't come for. He would have said I shouldn't come for exams if not for the fact that the course is being taken by two lecturers so he only has 50% on grading us. 

So does the punishment fits my crime?

And what steps can I take so that this man won't bully me.

am nt a girl.