Hi,
I wrote to
scientia@unisa.ac.za as advised and I finally got the answer after 2 weeks telling me this: "Please note that Unisa is an open-distance learning institute and, therefore, does not operate in the same manner as residential universities. This means that we do not have / offer internship agreements."
I am really disappointed but thanks for the viewer it's going to be a waste for me to loose a paid internship in a prestigious company only because my beloved university as an ODL institution can't provide me with such a document I think there should start doing it.