Ola Cabs / Ani Technologies — No show of taxi after booking from Vaishalinagar, Jaipur to Indira Gandhi International airport

My daughter Dr Shivangi Pandey booked Ola taxi on 13 feb at 3.00 AM from Vaishalinagar, Jaipur ( Raj ) to Indira Gandhi International Airport Dehli for me through her ola apps.
But taxi did not arrived, she called so many to office, but there was no answer.
It was very stressfull time, because at such an odd hour we could not do anything except waiting, After waiting 40 mints we went bus stand and hire private taxi. He charged 5500 Rs.
While Ola quoted me 2902 Rs.
How can driver cancel drive knowing the importance of International flight timing.
I had my flight to Paris by Vistara at 1.45 AM.
I wrote complain on [protected]@ olacabs.com but there is no reply.
Regards
Desh Deepak Pandey