I assume you've viewed the IMDb title page, which has no production or distribution company information, as well as an incomplete cast and crew list. As you may already know, not all titles listed in the IMDb is available for viewing or, in some unfortunate cases, a print of the film may not even exist. Let's hope this is not the case.
Is there a newspaper archive available from 1958 with ads of the film? Or possibly a film archive within South Africa? This may help to add any missing information to the title's IMDb page.