Ola Cabs / Ani Technologies — complaint regarding ola application

The ola application kept running in the background even after i tried to close it down because it was taking too long to search for a cab.in turn a cab got book even after i closed the application (There was no notification sent either saying a cab has been booked). Cancelling the ride cost me a cancellation fee. I should not be charged for a cancellation fee if it's the application that is not working the way it should have been.