They cooperate with international and other local forces, as any police do. But, they haven't eliminated scams, as OP claimed, that's complete bull.
I should preface it with, practically eliminated scams. Meaning eliminated to an extent that is maximally practically possible.
Even that is false. There are many more countries with fewer scams per capita, and with fewer amount lost at scams per capita. Meaning, Singapore falls behind other countries in elimination of scams.