Anna University — not allowing me to write my university exam

Address:

Ponmar, Chennai, Tamil Nadu

I am passed out student of anna university affiliated college and i gone to write my exam, according to clg rules college students enter clg before 9 and exam is about 10 clock and if anyone late he/she should wait and visit clg vice chairperson or higher person in charge and another thing they under taking two colleges distance between them is 300m above. And under semester exam if they don't shave they send out them even he is passed out student. That what they did to me at the time 9:50 and exam start at 10 clock and i went home without attend the exam
(I have to really undergoes college rules even after passed out) there is any action can take against college