Back in May paid for MCE (Shows on statement as: "Additional Collection") and checked bags (Shows up as: "Excess Baggage"). Fee credits appeared three days later.

Earlier this month signed-up for an elite challenge (Shows up as: "Frequent Flyer Fee/Purchase"). No credit after over 2.5 weeks. Don't see this as explicitly excluded under the T&Cs so I may call them after the four-week point.