Premature Wear and Tear on Reebok Shoes

I got a pair of Reebok shoes about a month and a half ago, but I've hardly worn them. Maybe like 20 times, tops. But I saw a small opening, about 5-6 millimeters wide, on the top of the shoe. I returned them to the store to get them checked, but I got a text message saying there was no defect related to the production. The shoes didn't get banged up, and I didn't wear them a lot. They never used them to play sports or kick anything. If the shoe is so bad that it can't handle the normal pressure from my foot, they should have just admitted it's a low-quality product. It's really annoying to see a company not taking responsibility for their own products.