All of South Africa's major banks have  branch in Braamfontein.
For an after-hour ATM go to BonJour Café @ the nearby Total Garage.

Ask our front desk for more information about alternative payment methods accepted in South Africa like Snapscan or Zapper which are great apps providing cashless / cardless facilities accepted by increasingly more vendors including the Neighbourgoods Market and most coffee shops or stores around the area.