Hey Hazchaz you need to stay positive for your baby. As some of the previous mummies have said, the scans and tests are not conclusive and the results are based on probabilities. If you were to read up and ask around, you will find that a number of mummies were worried about the results as well, but after the baby was born, the baby was found to have been perfectly normal!
I believe that if you are worried and anxious, your baby will "sense" it and that itself will affect your baby's well-being. You need to stay positive and happy for your baby.
I also had my baby at Kandang Kerbau Hospital and I fell into the category of having a baby with a "higher-risk" of Down's Syndrome. Doc advised us to go for the test but hubby and I decided that even if the baby was born with special needs, we would still accept and love her, so didn't go for the test and baby was fine perfectly fine.
BTW - no doctor can compel you to take any test that you choose not to. All doctors can do is to advise and encourage. In my view doing some of these tests and interpreting their results often causes more alarm and worry than is necessary.
So chin up and give your baby the best opportunity to develop into a happy and healthy baby by not worrying about something that you can't change but by staying healthy, happy and positive.