FYI MH cancelled my original booking (which had references re payment) so it actually cancelled two bookings! One paid, one not recognised as paid, so requested for a biller reversal.
The third one worked and I'm just rebooking the original flight. Fingers crossed that I can get a confirmation (from SITA) with eticket numbers, then I know it was completed!
Fingers crossed it gets all the way through the MAS payment gateway this time...