Overcharged

I booked a trip. Then cancelled. I was informed i was going to be charged 10. But instead got changed for the trip that i didn't take 300. Then i booked a trip the driver got there. I jumped into the car i said i am going to Pretoria. He said no its a mistake he cancelled but charged me R160 and R80.. Today i booked a car. It charged me immediately. Then and the end of the trip i tipped the driver it charged be again with the tip. So R79 and then R99. Then coming home today the same thing R70 then R90. For the 1st two amounts i contacted Uber and they are there is nothing they can do