As with all things SE Asia you will have better results appearing in person. It's not helped by the fact that they basically dissolved their DCA and created two new entities which are still "putting up their fences".

From what I remember the old process involved a technical knowledge examination a medical screening and a few other steps.

This guys (The best way to become a pilot) is relatively knowledgeable on the processes and is the closest you'll get to someone who can "help" you through the process.