The Gupta family will on Friday morning file responding court papers at the High Court in Pretoria t.
"The main contributor to the monthly increase of 0.5 percent was food products, beverages, and tobacco products," it said in a statement.
In July, PPI stood at eight percent.
The annual percentage change in the PPI for electricity and water was 7.8 percent in July, compared to 8.2 percent in June.
In mining, the annual percentage change in the index was 7.8 percent in July from 5.8 percent the previous month.
Stats SA defines PPI as a measure of the change in the price of goods, either as they leave their place of production or as they enter the production process.