Daily deduction with using Uber

Uber keeps trying to deduct random amounts..I have tried to call or email or use app to complain but every day they take R50 for absolutely no reason..this is ridiculous...don't use them.... They have done it 7 times now. My longest trip ever was R107 so there was never a R350 or more owing..plus they deduct before each trip. UBER IS *****ING PEOPLES MONEY.