SuzC,
You can ask the doctor about other treatment choices, but for the possibility of getting him Vidaza you could contact Celgene, the pharmaceutical company that makes it. They don't appear to have an office in South Africa, but you could contact
Celgene International in Switzerland by mail, by phone, or using the form on that page. They offer financial assistance to some patients (
here is the U.S. program website) and perhaps they'll offer it to your father.