Fry's Food

I went to 4150 E 22nd St. Tucson AZ 85711. I put all my groceries on the belt. I have a budget and had some much food stamps. I had my phone out for her to scan my card from the app. She said I was up to $300. I had to put stuff back. I thought she scanned it. She gave me the receipt. I looked at it and there were no discounts. I had to back into the store and ask her about it. Customer Service was closed. She said I gave her no card to scan. Who buys $300 worth of groceries and doesn't use there card? She pointed to the manager. She fixed it. It was $91 worth of groceries I was over charged because of her! I feel discriminated against. She was Hispanic and I'm Caucasian.