I bought a box of variety chips at Gateway. We found out the chips were not crispy after we had eaten for some bags. Then we found that the expiry date was on July so I called the store. The lady asked me to go back there for exchange. When I got there a few days later, she said it was too late for exchange. I argued with her that they sold expired food so they should suppose to exchange it and she refused. I was really mad and I wanted to know what else can I do?