Cab drivers cancel the trips as and when they wish. I booked rental, after making me wait for 45 min driver cancelled trip. Map showed closed road route to driver initially. I had booked a cab for an emergency, if you would trust ola and expect to be on time it would never happen even the person is dieing to go to hospital. In other case I booked prime, cab drivers calls and asks where is the drop location. If the location is far or traffic prone, he would cancel the trip without informing us.
If ola does not want to serve its customers, then they better shut off their business. People can move to uber, merry etc other better cab services.