Indian Railways — what should student do if they have mst and have to seat in sl class due to crowd in general bogie

Address:

Jamtara, Jharkhand, 815354

I had my mst still tt charged fine for seating in sl class even it was not booked. I understand that mst holders are not allowed in sl class but we are student and we have to travel daily for class. We have no other option to travel and the general bogie is always filled with so many people so we student have lots of problem to sit in general bogie that's why we move into the sl class. And it was a matter if just one stoppage from asansol to chittaranjan. As the source of the train is from asansol and our destination is chittaranjan. The name of the train is asansol-gorakhpur (13507) which runs on friday. Please help us.