Uber is greedy and not an honest company

I am really disappointed with the service delivery, it's been going on since last week where I book a trip for a certain amount and all of the sudden the amount almost doubles. The ironic thing is Uber will advise one to have enough cash for the trip. They keep adding a credit to me to make up and then in the afternoon I have the exact same issue this has been reoccurring, I can't be complaining every day this is daylight ******* we are a working class people and cannot afford to be paying double. This morning was last straw to avoid being harrassed bybl driver daily because of this cash issue I had a little extra and a credit of R19. I also drop my kids off at school so to avoid drama for them in the morning I decided to keep extra which I believe is totally unfair but I've tried on Uber for many years. My trip was R58 I was expecting to pay R39 for my trip. The driver made a stop to fill petrol and I told him I needed change he then drove around looking for a shop to make change because he didn't have any. My trip which should have cost me R39 ended up costing me R80!!! What a *******. How can such a reputable company do this to people I especially feel sorry for their drivers.