VRL Travels — Bus Driver charged extra 200Rs

Hi, I have travelled with Vrl travels to Mumbai last week and bus driver has charged extra 200Rs stating as luggage cost. We have been travelling since so many years and no other bus operator/ driver has charged extra cost. The luggage was kept inside the bus and it was only one sack and was not creating any problem to other passengers. If we are booking the bus with all charges including tax why the driver ask for more and without any proper receipt as well. Obviously if we are travelling will have luggage. Very disappointed with the service.