Delhi Transport Corporation [DTC] — Misbehavior of dtc ticket checker

I was travelling in bus number 144A from bakauli village to gtk by pass i bought tha ticket of 15 rupee from the charter app and on next stop 2 ticket checker come in the bus i was taking out my phone to show them the ticket but one of the TT snatch my phonr and start shouting now you wont be able to do anything i tried to explain him that i bought the ticket but he was not ready to listen after then he start shooting 99 percent of the collage students are fraud then i asked for my phone and showed him the ticket then still hi was saying that you bought it just two min. Earlier but I bought the ticket at 11.56 and the ticket checker checked it at 12.20 and i found some scratch on my phone when hi return it bus number is DL1PD4913