Family Dollar

I went into the Family Dollar in Dallas, GA and there was a display of 12pk cans of coke products 3/$12. It didn't say anything on the sale sign about it had to be a digital coupon. Went to the cashier to pay with my (6) 12 packs and it rang up $40+ when it should have been $24. She told me I had to have the app to get it for that price but the sale sign said nothing about an app. I downloaded the app but the app didn't show the coke sale. She couldn't override it in the system for me to purchase at the sale price. I asked her if other people were having the same problem and she said yes and they were paying the higher price. Now that is FRAUD and clearly against the law! Over charging many people and not allowing them the sale is a crime that is cheating the public. I will be contacting my attorney over this.