Moments before the mid-air crash could occur, the traffic collision avoidance system (TCAS) sounded an alarm in the Air India jet’s cockpit: “Climb, climb, climb!” Captain Kohli reacted swiftly, climbing and turning right to veer away from Vistara’s A320.
Later, Air India said “something had gone wrong between the Vistara pilot and the ATC as the Vistara aircraft kept descending while the ATC was giving different instructions,” according to local media.
This sounds like "deja vu" of the TU-154 mid-air collision over the southern Germany. We learnt something from that tragedy, follow the TCAS command: Air India "Climb", "Climb", "Climb", then obviously Vistara "Descent", "Descent", "Descent". Both women did well.
Edit:
About Indian Media, I think they should be impartial, maybe the statement of the other commander would be more appealing: Did the **** hit the fan, literally?