i bought a pair of reebok shoes and they fell apart, they are less than a month old, can someone help?

the store that i bought them at will not exchange these shoes, all i want is another pair of shoes, the person who looked at the shoes said that it looked like i had run something across the shoes, i know this is not true because on both sides of the shoes at the top of them on both corners the material came apart at the same place, i think the material they used in these shoes wasn't anygood. i have always bought reebok or nike shoes for me and my family because they are good shoes but i will not be buying reebok shoes anymore if they are not going to stand behind there product. can anyone tell me who to contact about these rotten shoes?