STAFF ACCUSES CUSTOMER OF SABOTAGING MEAT... "HOW DARE HE?"

WHERE IS THE CUSTOMER SERVICE AND STAFF ETIQUETTE? I bought a pork pack at my local PNP store and was ready to get cooking when I discovered a funny looking black looked like cotton wool inside the meat. Upon my return to the store the person in charge was called to reception and i was astound when he decided to tell me directly I am lying and that I had stuck this black piece of what ever it was into the meat. I was shocked and lost for words that i just stood there and politely asked the cashier to please just refund my money before I had lost it with this guy. FOR A STAFF MEMBER TO LOOK ME IN THE FACE AND TELL ME THAT IM LYING AND THAT I HAD STUCK WHATEVER IT WAS INTO THE MEAT WAS BEYOND UNACCEPTABLE I STILL DO NOT KNOW HOW TO EXPRESS THE DISBELIEF. WHY ON EARTH WOULD I STICK SOMETHING INTO A PACK OF MEAT THAT I BOUGHT AND RETURN IT WHAT EXACTLY WOULD I GAIN. It took me an entire week to write this post as I am still speechless......