another Affin rep called again to approve my card by today. so, i took this opportunity to ask few questions:
1) cashback is based on statement cycle. for this card, currently it's fixed at 16th of the month.
2) cashback determine from transaction description "bhpetrol". not by MCC. hence, transaction at petrol island pump and service station are also eligible.
3) cashback not limited to terminal used by the outlet. she said this was not stated in the T&C, but i told her it is stated as "affinbank terminal" in the T&C. she reassured cashback doesnt detect terminal type when calculating the cashback.

she said all terminals used by bhp in selangor/kl uses affin terminal. but i told her petrol owner may use different terminals anyway, we cannot control that.
4) about impending rm25 SST/card, she said during pre-GST time, Affin was quite lenient in waiving the GST (govt svc tax) without much issue. she was quite sure affin would still waive the sst easily later as well.
5) reasons for the delay because they received sudden surge of application in short period of time. Affin never encountered such surge before

i told her this is because of the 10% petrol cashback which is attractive.
Hope item no.3 holds true.
I will try at my branch in cheras if they accept cc for top up.