South Bengal State Transport Corporation [SBSTC] — Bus stopping at every point and picking passengers even though the bus is full

I had pre-booked 2 seats in the bus from Suri to Karunamoyee on 26th October 2022 at 8:00AM. By the time the bus reached our pickup location, it was fully crowded with passengers sitting on our pre booked seats. Those passengers along with the conductor expected us to keep standing for 30 minutes even after knowing our seats were booked a week prior to the journey. This behavior is utterly unprofessional amd irritating for passengers. We reserve the seats so that we get a hassle free journey. But if we have to travel like this then what is the meaning of such expensive tickets and GST if you cannot maintain your bus'condition or provide the passengers a peaceful travel.
Please take proper action against such things. Please keep a check on how many extra passengers are boarding this bus on the way so that reserved seats are free and passengers can get a smooth journey worth the money you make us pay for your tickets.