1.2% = Deposit RM500 into account
1.2% = JomPay, IBG & Instant Transfer, if use transfer... to any bank will do, except OCBC
1.2% = Use RM500 on CC/DC, online purchase... retail purchase... pay wave... as long as u use the card (if u have other cashback CC and finds that this criteria not worth fulfilling, then you can look at UOB eAccount, provided you can reach certain amount of saving)

iirc, same bill with multiple transaction still considered 1

this is interesting... haha, just checked with the T&C:

Multiple payments within the calendar month bearing the same reference will be deemed as one Bill Payment. For example:
(i) multiple payments to the same OCBC home loan facility account; or
(ii) multiple payments to the same participating billing organisation, unless each payment is uniquely identified to a different account; or
(iii) multiple payments to the same account with any bank or financing institution.
OCBC Bank’s decisions as to whether any 2 or more payments shall collectively be deemed as one Bill Payment shall be final, conclusive and binding on all parties concerned.

maybe they updated new T&C after spotted many people did same as you haha

or maybe because your 2 transactions are pretty far apart? so the keyword "whether" kicked in... hahaha