Combing through the latest 2018 credit card pricing guide, it turns out they do make mention of this 2.75% charge on all international payments/purchases. (I found the guide on this page https://www.standardbank.co.za/southafrica/personal/products-and-services/bank-with-us/credit-cards/our-cards, under "What it Costs" when you select a card - in my case it was the Gold Card). This change was never communicated to me though, so still not happy about it.
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