Karnataka State Road Transport Corporation [KSRTC] — Forcing to give the exact change when I travelled from Mysore to chamarajanagar bus no.KA57F4507

When I was traveling from Mysore to chamarajanagar at 1 pm I gave rs.100/- for the ticket but he refused to give the ticket and forcing to pay exact ticket amount of 70/- but he is having a so much of change in his hand(10/- &20) but he was not ready to give the change so requesting to take necessary action regarding this and help the passenger from this type of harassment.
Thank you
Dr Manjunath