Just to recap once and for all:
CIMB Malaysia's AirAsia Savers Account interest is 1.2% flat, no tiers. They mentioned 2.4% is because if you don't make any over-the-counter transaction in a month and your balance is above RM5,000 throughout that particular month, you'll be entitled to an additional RM5 credit, which is the equivalent of 1.2% of RM5,000, hence the tricky 2.4% as can be misunderstood.
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WTF again!! They told me this morning 2.4% for balances above 5k RM calculated based on the balance of the account, inclusive the 5RM rebate. When I pointed out the "1.2% flat rate, no tiers" statement, they couldn't answer. Now I have to go again to open the moneey multiplier account. Arrrgggh!!