Overcharged by UBER driver - (App)

I clicked on R126 on the app to be transported to Kya Sands after been awarded a discounted rate by UBER . When I arrived at my destination , the driver requested R131 . In my professional opinion the app software is written incorrectly an needs to be revisited and amended . This is the second time this happened . This creates a huge misunderstanding between the driver and the passenger . This is considered as ******** . As a legal administrator I have placed this activity on record for the future .