Processing time and contact number

Hi,

I'm holding Vietnamese passport and currently living in Australia. I have applied the travelling visa for 4 weeks. I called to Consulate General of China in Melbourne today and they said it has not been approved. As I will travel to Japan next week, and then flight to Hong Kong after that with my boyfriend. So who should I contact with to ask about my visa processing and can explain my situation? I called the Consulate General of China in Melbourne before but the lady couldn't give me any ideas and hung up the phone in the middle of the conversation.