Tamil Nadu State Transport Corporation [TNSTC] — Forcefully Issue of Ticket to school Student

My Son was Travelling back from School on route number 382A from Pammam to Nagaercoil in TNSTC Bus registration Number TN37 N1893 @ 4pm on 19/10/2022. Conductor forcefully issued ticket to TOW students travelling in the bus instead of being in school uniform and having the ID card.
Also he made a phone call and acted roughly with the kids. The person speaking from other side threatened to snatch the ID card. Since they are studying in school labelled as "international School" they are not entitled for free travel.
Please look into the matter and keep me informed if the rule from Tamilnadu govertment is such that the free travel is not entitled for students studying in "international School"
Thankyou.