Indian Railways — complaint regarding the t. t who allot berths to passengers

Address:

Deoghar, Jharkhand, 815353

I boarded the train from madhupur junction with unreserved super fast ticket to kolkata. After boarding i asked t. T to allot a berth in ac or in sleeper as because it's 5 hrs journey and he replied that he will off course provide me berth in ac but i have to pay rs. 500 to him otherwise he can't.
Now my question is that why should a passenger will pay more than the ticket amount to anyone if there is vacant seats in compartments. The person who next boarded the train was provided seat in ac because he paid to the amount to t. T.
I request to honable railway minister to take strict action against the person who is asking for bribe from passengers

Thanking you,
Piyush kothari