(Reuters) -South Africa have endured "dark days" and their 2-0 sweep in India reflects their new mindset, said Proteas captain Temba Bavuma after his team completed a memorable series victory in Guwahati on Wednesday.

Despite being the reigning world champions, few expected South Africa to dominate India in the way they did - winning the series opener in Kolkata inside three days before beating the hosts by 408 runs in the first-ever test at Guwahati's Barsapara Cricket Stadium.