SPAR goods rotten

Bought Smoked Chicken Fillets from SPAR Tyger Manor on the 5th of Feb (R28,25) for lunch. Got back to the office only to discover the chicken was off. I could not go back on the same day but kept the item in the fridge and took it back on Monday (today 8th Feb). They're not willing to replace it without a slip. I however showed them the transaction on my phone (time, amount etc). They still could not help me without the slip. I did not kept the slip as I regularly (not anymore) buy from the SPAR (lunch, monthly office coffee/tea supplies etc etc) without any issue. Even though the parcel had no expiry date I don't expect my grocer to sell rotten meat to me. I needed to leave my phone number so they will contact me if they going to replace it which was not acceptable to me. Nevertheless I did not buy my lunch from them today and will not in the future. So whoever reads this..stay away from perishable goods at this SPAR and if you do, keep the slip.