It's a Telkom problem - sometime late this morning:
Not being reported in local Press, but Eye Witness News carried this story in this afternoon's news reports:
Businesses hard hit by Telkom internet problems
Zaida Gangat | 13h46
Telkom’s authentication services were down on Thursday affecting internet access for many people around South Africa.
Eyewitness News was inundated with irritated users who said they were unable to access their internet service for several hours.
One business owner said it was affecting his business.
“You cannot access the internet at all, which means you can’t trade, you can’t get your emails, you can’t do electronic banking, you can do absolutely nothing,” he said. “It’s affecting businesses countrywide.”
Telkom said it is aware of the problem and added that it is addressing the problem.
Being that it's Silly Season in this part of the world, don't hold your breath for a quick fix (!)