Uber Rides Incorrect fees

Hi I booked a ride with Uber on the app. Cost was R100. Driver took a longer route and I was charged an additional R46. I complained on the App but was advised that the amount they charged even though the driver took a longer route was correct. I am very disgusted that Uber can quote and chageva fee and then conveniently increase the amount. R100 versus R146. You are a *****.