Rotten polony

Recently i went to buy some grocery in discount foods next to mtn taxi rank in Johannesburg c.b.d i bought 500g advance meat garlic polony.When i got home only to find it was rotten.I bought another one again in the same store and it's rotten again.The till slip it doesn't have the store contact details.This is highly unacceptable,it means to prove yourself you need to go back to the store with the receipt and the product.I imagine how many customers are experiencing this problem.I tried to phone the manufacturer only to find the number doesn't exist.