Twenty-eight female guards were unfairly dismissed by a security company because the client‚ Metrora.
South Africa won't run out of food but it could get so expensive that people who could afford basics might go hungry.
"The country has always produced more food than it consumes," AgriSA president Lourie Bosman said.
Despite this, more people faced the risk of going hungry because of rising food costs, according to Thomas Yanga of the United Nations World Food Programme (WFP).
He said that rising food prices have created a "new face of hunger" as 100million people worldwide had been plunged into hunger since March last year.
Yanga said people who could afford can no longer buy food.
WFP defines hunger as not being able to access basic food requirements to meet nutritional needs.
This leads to malnutrition and weakens the immune system.
"But because food is produced locally, the impact of food increases is slightly reduced," Yanga said.
Katishi Masemola, general secretary of the Food and Allied Workers Union, warns that South Africans "will go hungry in a matter of months" if the prices continue to spiral.
Masemola said the government needed to stop the increases, especially for staples, and punish those guilty of price-fixing.
"They are really making a killing. People have to eat and will spend more of their income on food if they have to. Retailers are taking advantage of this," Masemola said.