Do Not Use Uber at Gautrain station in Pretoria

I booked an Uber ride from the Gautrain station in Pretoria to UNISA. When I arrived in Pretoria, I called the driver and informed him that we were waiting in front of the Gautrain station in Pretoria. The driver told me that I had to walk 1.5 kilometers to the pick-up point, to the MBT petrol station in Harmony street. This was unacceptable because the distance to my drop-off point, UNISA, was 2.5 kilometers.