From cricinfo...

“If they go ahead and have a 20/20 game does SA start all over or continue from 7.3 overs?" --- They'll continue, of course. But the fact they've lost two wickets already leaves them a slim chance of any runs getting added to their final total on DLS. Which would have been the case if they were no wickets down, or even just a wicket down.

Loooooooool restart the innings ffs