I can see flights on SAA from GRU to JNB, just having a quick look
Nov 11 in C on SA223
Three more flights on the same day on SA235 after connecting to LHR on LH
Nov 10 in C on SA223
Nov 10 in Y on SA223
Nov 11 in Y on SA204 after connecting to NYC on UA
Nov 12 in Y on SA204 after connecting to NYC on UA