Extremely poor service by Olacabs

Ola Cabs

I had booked Olacabs for airport drop in Chennai 1 full day in advance. But when I called 30 minutes prior to my scheduled pick-up I was informed no cab was available and they are "trying to locate a cab." With 24 hours of notice and with GPS in every cab, I don't know how they couldn't allot a cab to me on time.
I did not get any response from their booking desk after this and nearly missed my flight because of Olacabs.
This is by far the worst cab service I have tried in Chennai. Fasttrack, Bharti call taxi, NTL are much better.