South Bengal State Transport Corporation [SBSTC] — Rude and corrupt behaviour of bus conductor

I took a bus ride from sbstc Haldia to Kolkata on 17th November. It was a 09:00 AM bus that departs from Haldia to Kolkata, when I took bus and handed over a 500 rupees note to bus conductor for ticket to Santragachi, he became annoyed and started screaming, abusing me about that I had handed him a 500 rupees note and he do not have smaller currency notes to return me deducted money after issuing me a ticket, though he had enough cash, he was not returning money and continuously abusing and using slang and wanted to teach me a lesson regarding 500 rupees note. I have earlier travelled many times from sbstc, but haven't faced this kind of humiliation, other bus conductor just politely say that they do not have enough cash to pay me the deducted money. Later this same bus conductor returned my deducted money after so many requests, during returning he kept some money and did not return me fully( the amount that I should had after deducting ticket price), the conductor was using this kind of tactics to some other passengers as well.
So I would request you to kindly take appropriate actions so that the bus conductor should not harass other passengers.