Air India — Did not rescheduled my flight on time

Address:

A5,sector A,Sainik Vihar, Nandanagar, kunraghat, gorakhpur, UP

I was not able to reschedule my flight on time and in emergency I booked another flight.
Because on contacting air India they put my call on hold for 30 minutes and declined it after that. The WhatsApp no. They provide and chat box"maharaj" was also of no use.

My flight one was Z2WDG and last name Singh.If air India responded on Time and reschedule the flight then I didn't need to book another flight on 9 Feb 2022.
So, I want a complete refund of my flight of 13 Feb 2022.