Sydneydreams, I don't know why yours is taking so long. I got a reply from Vetassess within 6 weeks (Sent the application Sept 20, they probably got it Sept 30, then I got the positive response Nov 14.)
Maybe your lack of reference letters is what's holding up the process. I gave them 100% everything they wanted, clearly labelled, certified. So my case was easy to approve. Maybe they are still undecided about what to do about yours. You could call them and ask kindly, "Is everything alright? I could try to get you more proof if that's what you need. Please tell me what you need". I find that people are shy/there is a lag/hesitant/etc to contact people to tell them they need something, but when you ask them, they will tell you.
My references didn't call me to say they got contacted. So no, they didn't contact my references. But my friend tells me that his friend in Egypt applied for some other visa, and they called his school to verify that he has the degree.