Uber drivers *****ing from riders

I booked an Uber & the fair indicated that it was R32 upon getting in the Uber the driver asked if I had changed money which I told him that I was okay.The driver was nervous as we drove to the destination.Suddenly a message came on the Uber indicating that the fare was R51 & I had a discount R3 so I must pay R48.I screenshot the details of the driver & as we arrived my app could not show that the trip had come to an end.I paid the amount then the driver drove out & my app indicated that I should pay R32 but the driver was gone.I believe that this driver has something that he is using that is sending messages of high prices.