Bangalore Metropolitan Transport Corporation [BMTC] — bus conductor not providing change and giving different ticket

I took bus ka57-f[protected]d hebbal) today from marathahalli bridge to doddanakundi. I gave rs.10 to the driver and driver gave rs19 ticket instead of rs.5 ticket and said now price has increased to rs.10 and will give different ticket by mistake he typed 19. After crossing kalamandir, he took back old 19rs ticket and gave me a rs.5 ticket starting from kalamandir and said from there it is rs.5 and was not ready to give back my 5 rupees. I think he might give the other 19rs ticket again to someone else, as it is till kasturi nagar. He has cheated me and will be cheating other people as well with that ticket. Please take necessary action.