Family Dollar complaint: Items on shelf with discount stickers not to be sold

I went to the Family Dollar store in my neighborhood and spent time going thru boxes of discounted items for my grandchildren only to get to the cash out counter and discover they cannot sell these items as they are Pennied out, whatever that means. I told the lady, who was not the most pleasant cashier I’ve ever seen in the store, that I would be okay with paying the prices on the items. She I guess the other lady was the manager said they were unable to sell them. I told them they needed to get them off the shelves then. They agreed but made no effort to go take care of the matter. First off, the cashier did not tell me about ALL the items. She told me about one little box of leggo people. I asked after checking out and accepting my bags if the other little items were in another bag as they were not in the bag with my other purchases. She said Oh, we can’t sell any of those items. Needless to say, I stormed out of the store. Another customer came out behind me and said I can’t believe what just happened.
This has never happened to me in a Family Dollar store before but has happened to me in Dollar General, Which I no longer shop. It is nice having a store close to my home to shop, but if this should happen again, I no longer will shop at Family Dollar stores.
You have a young black man as a cashier at this particular store on occasions and he is the friendliest most pleasant cashier of all your cashiers. I’m not sure what kind of training this young lady had but she certainly needs to go back for a refresher course.