Damaged clothing

I bought a Mickey Mouse printed T-shirt for my son on 31 August 2024. I now notice that the print has since started to tear and pieces have already fallen off. The stores are refusing to return the item because it has passed the 30 day policy by 2-3 days. The T-shirt doesn’t have a tag on but I have the receipt, it still has the 100% cotton sticker and it has never been worn due to the fact that it was slightly to big for my son when we purchased it