Tamil Nadu State Transport Corporation [TNSTC] — Not given proper seating

I had travelled from Coimbatore to Chennai in SETC unreserved ticket which is worth of 500 rupees. It is a non-AC sleeper and semi sleeper bus. As it was an unreserved ticket, I had asked for the conductor and driver to allot me a seat if available. At that time, they said they'll say the result when the bus starts. As soon as the bus started, I asked them again waiting patiently. They called me in and gave me a semi sleeper single seat in the first row. I assumed I was alloted to that seat. They stopped the bus for refreshment for sometime in a restaurant around 10 - 10.30 pm. But just after the refreshment, I was asked to sit in the conductor seat which is beside the front door of the bus. It had no push back option, and have chances of getting fall down anytime when breaks are applied. The conductor told I was sitting in some other person's seat, and so I should go to the conductor seat which is in the front. I had no idea then why did he let me in inside the bus if seats were not there. I was totally confused, and sat there for a while assuming someone would get in the coming stops. But nobody came, and the conductor occupied my seat and slept fully there throughout the journey. I had no option but to stress myself after paying just like everyone else. The driver and conductor switched seats inbetween for some intervals for driving. But I was sitting in that front seat without any convenience. I usually see the conductor/driver would use that seat for sitting purpose sometime, and for lying, they had a separate seat beside. But they gave those conductor's sleeper seat for 2 members with the amount of 500 rupees for each. So I could not lie on my back throught the journey, or even sit stiff as nothing was there to hold when bus turns or sudden breaks are applied. I think the conductor name is Raja, as per his conversation from another passenger, and not sure about the driver's name as both of them did not have their name card in their shirts. The Vehicle number of the bus is TN 01 AN 3161. This horrible incident happened to me on the bus which started at 8.30 pm on January 21, 2024.