I just off the phone with MPO call center agent... I would say that customer service of MPO is far better than SQ. With SQ i have to wait for 60-90 mins before anyone can answer the call and if when they answer, they hardly help.
Today morning when i called MPO, i spoke with a lady ( i guess call center is based in Philippines, picked up from her way of speaking). She spoke clear english and explained the fare rules clearly and also helped me with my bookings on BA. Very good class of customer services... no wonder CX is one of the best. Keep up the good work ^