pick and pay mall of the south- stinky maize meal

I purchased my monthly groceries - as per norm at Pick n Pay Mall of the South , once i unpacked the groceries then there was a terrible stench all of a sudden , I cleaned everywhere with detergents but nothing and when i open my White star mieliemeal the stench became worse! I am so disappointed and have had to put it outside , till i can take it instore or they come take it coz what is this ? you guys trying to kill us ?