Tamil Nadu State Transport Corporation [TNSTC] — Conductor charging High amount than the original amount

I was returning from sulurpeta to thachoor and ticket cost is 80rs. But the conductor charged me 100rs. I was shocked to see the amount he charged on me. Than i asked him why did you cost this much ?? He thought I'm just a kid so I can't question him. He was talking rubbish saying this government is totally different from other government buses I don't know how can the government itself differ?? And i called my father saying him that they charged me like this... As soon as the conductor saw me talking to my father he came to me and started checking some bit of paper and started showing me that waste paper... I again asked him that this is not the actual cost we have knowledge on cost travelling in buses frequently. He looked scared and went to the driver and he talked for about 5 to 10 mins and the conductor came to me and asked me to give return the ticket i was like why? He said I unknowingly given you the wrong ticket. But how??? Is that unknowingly even after asking him he said me rubbish and after talking to the driver he's saying unknowingly... He even charged wrong amount to all the co-passengers. I got my ticket back only when i raises my voice but what about my co-passengers?? I request you to take action on this. Thank you.