NQOBILE DLUDLA SOUTH Africa's big retailers are working round the clock to replenish shelves with food in hundreds of stores looted this week in some of the country's worst unrest for years, they have revealed. Retailers also said they are racing to keep stores unaffected by the violence stocked as some shoppers were stripping shelves with panic buying, though blocked roads and disruptions to supply chains were hampering their efforts. Retailers were just starting to recover from months of coronavirus restrictions when the violence triggered by the jailing of former president Jacob Zuma erupted and the looting could now set…