Big business is largely white controlled, incl MTN. There's a debate about how much the PIC, government employees' pension fund, controls, but business is white-run. 
There's resistance among many whites, aka the ANC's most vocal critics, to acknowledge big business especially are part of corruption - there's the briber and bribe, which they call 'commission', 'cost of doing business', etc and BEE. BEE was big business' creation, the ANC's payoff to keep the apartheid-era exclusionary and high-profit economy model. It's well-known (see Sampie Terreblanche and https://www.timeslive.co.za/sunday-times/news/2016-09-08-how-ancs-path-to-corruption-was-set-in-south-africas-1994-transition/). This is one reason why we have a high-cost, low value and unproductive economy where only large companies and their executives truly benefit, MTN & Vodacom in their sector, banks in theirs, etc. 
That's why hypocritical breast beating by people like Johan above don't move me, although they have a point.