I wrote on autism, haven't got my assignment back yet, but got a v good mark. Sounds from the comments made that perhaps you weren't off topic but maybe needed better structure. How you put forward your essay and arguments at this level is quite important, as is referencing multiple sources, I think they would have said if you were off topic. How bad was your mark?
I would like to improve the mark but my structure seemed fine to me as I had distinct paragraphs per topic discussed and an introduction and conclusion.
I am not sure as to what is expected and this is my first time with distant studying through UNISA as I did my degree through full time studies at UKZN previously.