Air India — flight cancellation

I booked 3 air tickets air india flight ai 191 from new delhi to newark (Usa) on august 11, 2019. Flight was scheduled to depart at 9 pm from new delhi. But at 8 pm just one hour before departure announced flight is delayed to 9 : 45 pm. But at 9 pm said flight is cancelled. After that madness started at counter and after repeated requests air india personal came and told us will move us to different flight. But no instructions we were shufllfed from one gate to other again security checks and after tormenting and biggest harassment of our life were sent to another flight. We arrived in usa 5 hours late and plus got sick and missed work due to poor management by air india at delhi airport.. All three o[censored]s are suffering from fever and respiratory problems because of that. I am physician and becos of all this i had to miss work that i hold air india responsible for that.