Sao Paulo flight cancelled with no information

My flight SAA223 on Sat 21 March from Sao Paulo (SP) to Joburg was cancelled that morning but, inspite of having cell and email contact details, no message was sent about this. In fact at midday I was issued a boarding card in Curitiba, Brazil, for the later flight. There was chaos for passengers arriving from connecting flights at the SP airport and only after several hours could an SAA rep be located. No information was forthcoming for several hours. My Voyager miles were not credited for the flight that was then put on a day later (left two hours late!) and I had to spend about an hour on the phone getting Voyager to credit my account with these miles which could not be achieved when trying to complete the \claim missing miles"facility. Shoddy treatment of passengers when SAA knew many hours in advance that they had cancelled the SP-Joburg flight. One understands that things like this happen"