This is complete chaos and SA are still chasing some worst record but good thing is they already won this ODI trophy so they lost anything other than just a humiliating win from the Englishmen.
And you are right this now stands as the biggest ODI defeat by margin and also SA's second lowest ODI total in the history.
No understanding their strategy as second series win and second worst ever defeat for them, they needed to be thought about this because this always have serious impact on player's mentality in second ODI England done good resistance, but South Africa win this game by narrow margin but in third ODI things were completely out of context.
34 years old Yorkshire legend Joe Root score his 19th ODI century with the help from Jacob Bethell who score his madden century, and they score 414 in 50 overs but in reply South Africa bundled out on 72 just 3 batsmen able to touch double-digit Jofra Archer and Adil Rasheed done good damage and have won by highest ever margin for England this consolation win is going to be good boost for England for t20 series which is going to start on 10th September.