Processed food tastes sour due to incorrect temps

I purchased crumbed chicken fillets from food *****s market in Sunninghill a week ago and once grilled in da oven..my wife and came to da same taste dat da fillets are Off... tasting sour..I will never ever purchase any longer from Food *****s market any longer..I drove 15km away hearing a friends compliments of dis store but I guess he does not know what is behind da scene's of processed foods..I'm an inspector for one of fast food outlets and will escalate dis serious food critical issue urgently.. totally disappointed wid food *****s..becomes a food haters market..