Family Dollar complaint: Treated horribly for a mistake

Horrible service!! With covid people should be given a break! Im dragging a 5 year old behind me, i wear glasses and the masks fog them up badly. The sign stated no cash back near checkout but i did not see it and chose the option. The cashier said we normally dont offer this. She showed me the sign and i apologized atleast 20 times my glasses were fogged. The cashier was very nice… but once she got the manager on duty it went downhill. I offered canceling out my sale and forgetting it but instead your manager decided to belittle me, slander me, and then SLAM the cigarette case closed and walked away, steady slamming anything she can find. All the while steady talking about me under her breath. Wish i caught her name but as i stated glasses are all fogged up and at this point she has embarrased me! I will never be back and she should be punished. It was an honest mistake. She was a african american women with dreads. Very rude and nasty.