Jos Buttler, Dawid Malan tons, Jofra Archer six-for snap England losing streak.
England failed to defend 342 as Miller 58* leads South Africa clinch a 2-0 series victory.
England slump to 27-run defeat despite Jason Roy century.
South Africa name 16-man squad for ODI series against England.
England have named a strong 14-member squad for the three-match ODI series in South Africa that begins in January.
