Charged for cancelled trip

On Sunday (1/05/2016) we were charged R618.02 for an Uber trip we cancelled. It seems that we were charged as if this trip took place. We waited for over 40minutes (which was twice as long as the estimated time) for the driver to pick us up, we saw that he was not in the correct location, after phoning him and trying to direct him to us, he was persistent that he in fact was in the correct location. We then phoned him to cancel the trip. We are okay being charged a cancellation fee, but how can we be charged R618.02, for a trip that did not take place?