With the advent of things like Coursera, EdX and Udemy, I don't know why anyone would study at a local computer college. Just do it online at one of those. Udemy often has pretty good deals apparently.
You can do the courses in the evenings after work, and in no time you have something recognizable, plus practical skills.
Coursera, EdX and Udemy are also recognized internationally, unlike any South African computer college. They won't replace a university degree, but they don't have to.