Vistara — Unprofessionalism- Left on connecting flight

Address:

New Delhi

PNR# 6EZM59. I booked this ticket for my wife. This is a connecting flight from LKO to Pune via Delhi. There is 1h 10m layover in delhi, got a call at 5:31 from a vistara personal(already shared number with vistara customer care) and he asked to reach quickly with in 5-10.
I informed him that she is done with security check and will be there. She was where between 5:37 but only to find no staff at the gate. I called the person again but his words were "Don't call me again". It seems he just called for covering thier miske, they must have already closed and left.
Customer Care - Please check with ground staff.
Reason for Delay: Long queue at security checkin for connecting flight and vistara staff not able to coordinate the same.