Tamil Nadu State Transport Corporation [TNSTC] — pnr: t26293981 ticket has been misused

Address:

Pudukkottai, Tamil Nadu, 614622

The above pnr number is cheated from the conductor.

I booked three tickets but unfortunately one people can't be reached that time. Another two members has been travelling. At the same time your conductor give my confirmed ceat no 10 has been given to third party without my knowledge.
I asked the conductor he said that ticket has been cancelled.

How you give my confirmed ceat to another member?
If it is possible then why not return the 1member amount to me or at least partially?

That is my wish if travelling or not but how you give my ceat to another member?

I want the proper reason or waiver the 1member ticket.
I need the immediate reply and action otherwise i will raise a complaint to high superior.