I LOST THE RECEIPT AND THEY DONT WANT HELP ME - Consumer Complaint for PEP STORES

I BOUGHT SCHOOL SHOES AT BOTHAVILLE PEP STORE JUST BEFORE THE SCHOOL WAS ABOUT TO CLOSE LAST MONTH BUT I DON'T REMEMBER THE DATE, AND I LOST THE RECEIPT AND NOW I JUST WANT TO EXCHANGE THE SHOES AND TAKE THE BIGGER SIZE AND THE CASHIER SAID THEY ARE NOT GOING TO HELP ME WITHOUT THE RECEIPT I HAVE TO SELL THEM TO SOMEONE TO GET THE MONEY TO BUY ANOTHER PAIR.MY CHILD WENT TO SCHOOL WITH BARE FOOT AND YOU CAN IMAGINE IN THE MORNING ITS STILL COLD.PLEASE I NEED ASSISTANCE WHAT TO DO.