Hey Niri.
The whole setup to create your first pin works a little bit funny
. I also struggled the first time getting it right. Try the following, it worked for me!
1. I used this link [https://oasis.unisa.ac.za/patroninfo]
2. Type your surname in the first textbox (small caps)
3. Type in your student number
4. Afterwards, type the pin in that you want to use
5. Press the submit button. The system will recognise you as a new user. The following page displayed will give you the opportunity to create your pin.
Weird procedure, but ja, I go in!