Thank you
You can't argue and give fatwa if you are not one of these things below. You can only keep it to yourself, which is referred to (taqwa).

1. Appointed by the government in power
2. Educated in fiqh
3. Educated in the matter at hand (in this instance, Finance)

If everyone who belajar from their ustaz (who is not super qualified anyways, especially not in finance) is giving out Fatwa, the Islamic world would be quite in chaos - as in more chaotic than it is right now. In this instance, I would refer to the Majlis Fatwa Negara and the Fatwa Council in the SC. ASNB, as a Unit Trust Management Company (UTMC, just like Public Mutual and CIMB Principal) would be under the purview of SC.