BMTC Volvo — conductor refused to give change

I boarded a volvo bus (Ka 57f 330 - vydehi hospital) at 5:30 pm from marathahalli stop to spice garden on 4th february 2020. The ticket fare is 20 rupees. Since i didn't have change i gave him 100. He shouted at me, took 100 rupees and issued ticket. I would like to bring to your notice the following points against this conductor.
1. He refused to write balance amount (80 rupees) behind the ticket
2. When i asked for balance one stop before my destination stop, he refused to give
3. When it was time for me to get down, he made me go behind him and ask for change. Again he shouted and gave me balance.
I want to know what action will be taken against him? He should be given a strict warning to behave decently to passengers and avoid such instances in future.
I can give few solutions also for this kind of problems.
1. Ask the conductors to carry previous day's change with them for the duty next day.
2. Make the ticket system cashless through paytm or any apps. Then problem of change won't occur. Also these people won't steal money from passengers!

Looking forward to issue a warning against this conductor.

Thanks sajana