Bangalore Metropolitan Transport Corporation [BMTC] — bus won't move even after all the seats have been filled

I boarded bmtc bus : KA-01 FA 2155 at 7:20PM on 11 Dec 2019 at Sathya sai bus stand and the driver did not move the bus until 7:45PM . I don’t think that much wait time is even allowed. All the seats were filled in 10 minutes still the driver wanted more passengers. I was among the first few unlucky ones who boarded the bus and had to tolerate a wait time of 25 minutes before it started moving. Since i had already bought the tickets I couldn’t get down. I take less than this much of time to reach my destination which is spice garden road. This has often happened with me hence raising a concern, BMTC should respect the precious time of the passengers especially at such late hours and in such insane traffic.