West Bengal Surface Transport Corporation — wbstc bus ticket booked but seat not provided by conductor

REFER- 63NZQXHN(Operator PNR: 63NZQXHN )
Booked WBSTC Bus through Make My Trip India for journey from Digha to Kolkata on 15.05.18. Bus start time at Digha 6.15 am. My seat no 14.
But as I board the bus at next stop, the conductor resold my seat to another person who board from Digha. Bus no WB 11 D2817.
The conductor did not allowed me to sit at my seat. So I was forced to travel 4 hours by standing in crowded bus. He did not showed his Id card, list of seat booked and harassed me.
So, I want compensation for inconvenience caused to me.
Attached photo of Ticket, Bus, Bus Conductor.