I definitely recommend BMS Organics. Amazing food, and very sure its vegan. Quite pricey though.

BTW TS I think you should'nt just dismiss a Vegetarian restaurant just because they use the word "vegetarian" and not "vegan" in the name. I think lots of people in Malaysia don't know what vegan food is. Its'bad enough that we are such a meat-eating country that when you tell people that you are vegetarian their response is "go eat grass la"

Unless you are specifically looking for a type of cuisine, lots of vegetarian restaurants will have vegan suitable dishes.