CHARGED WHEN DRIVER DID NOT HAVE PETROL IN HIS CAR TO COMPLETE TRIP

The driver picked us up at Waterfront, then along Settlers Way (opp. Pinelands Golf course) - his car stalled de to no petrol?? We then waited a bit for him to arrange a colleague to fetch us and drop us off at our destination. The driver told us that he had cancelled the trip - we felt sorry for the driver that had now lost the trip, so I paid him R60 to cover his loss. His colleague soon arrived, and when he dropped us, my sister paid him R50.. We weren't sure what to do - because the driver had already told us that he had cancelled the tripped, and he seemed like an honest guy , so we paid him cash for his trouble. But during the night I receive an email to say that I was charged R61 for the trip, instead of the R98 initially charged when I booked the trip.

So what is really going on here?

I don't feel safe leaving my card linked to Uber any longer - trips are charged and then later changed.

This driver told us he cancelled the trip - so we ended up paying an extra R110 to accommodate him not having enough petrol in his car to complete the trip!!