Family Dollar complaint: Manager and cashier were extremely rude

I purchased a phone card from the store, and tried to activate my phone. After several unsuccessful attempts, I took it back and explained the problem. The cashier INSTANTLY caught an attitude. She told me “well, there’s nothing we can do about it, so I don’t know what you’re gonna do” and I contacted customer service and spoke to a representative. I learned that the card was improperly scanned , and it needed to be rescanned . So I went back and explained what I was told by the representative and her attitude got worse. I even talked to the manager and she was the same way. Her attitude was even worse . She kept complaining and saying the phone company was closed. I explained to them that they weren’t , and she continued. I even tried to offer buying another. She was like “baby there’s nothing we can do about it , it won’t work come back Monday morning” her facial expression read “annoyed” instantly.