Air India — flight ai 481 departed before time without any information and air india staff misbehaved at airport

Address:

Bhopal, Madhya Pradesh, 462011

Air india flight ai481 from bhopal to pune departed around 45 minutes from its scheduled time which was 10:45 am without any information due to which i and 2 more passengers missed the flight.
When i reached counter it was closed, and no one from air india staff was there to attend passengers.
After some time few staff members from air india came to attend us at around 10:15 and said that flight departed.
There were 2 more people present with me who missed their flight just because incorrect information was provided on all airport screens about the flight and we all were shocked.
Screens which was suppose to give correct information about flight were showing departure time 10:45 am at 10:15 am, while flight was already departed. Also after a lot of efforts and discussions we met with airport manager, i requested him to help but he refused very rudely saying "mai aapki kuch help nahi kar sakta.. Aap complaint kar do meri".
One of the staff member said "captain jaldi aa gaya tha to jaldi depart h gayi".
Even one staff member misbehaved with my relative and said "5 baje se aa ke baith jao airport pe.. Humko kya karna".
I have taken screenshot of air india website which was showing flight scheduled departure time 11:10 am in the morning and suddenly after some time it showed departure time 10:15 am.
Also i have taken screenshot of airport screens which were showing std 10:45 and status "departed" at 10:34 am.
I requested airport manager to accommodate us in tomorrow's flight but he clearly refused to help as if he was not at all interested in listening our issue.
We missed our flight just because of incorrect information provided on website, display screens and air india staff and now we are struggling to get our refund back.