A few months ago I found reaching SQ absolutely impossible. Yesterday and today, my call was picked up on the first ring. But both times they were picked up by Philippines call center. In the past they were "OK". This time around they were just clueless. Today I wanted to make a change to a booking made on singaporeair.com, and because the first leg was operated by Scoot they refused to touch the reservation at all.

I finally figured out "commercial" booking. I think in SQ talk this means anything that is not redemption or award based, i.e. paid reservation.

Oh, and I also figured out SQ has a published page on the 24 hour cancellation policy for flights to the US. It's here:
https://www.singaporeair.com/en_UK/u...-service-plan/