Family Dollar review: discrimination and refused to sell me the products I needed for my kids

Do not shop at the Family Dollar store #09080 in Richmond Hill, GA on Mulberry Commercial. I wanted to purchase ensure for my kids due to the doctors recommendation and it was on sale for $3 and some change. When the manager Carrie was ringing up my items, the price came up to $9.00. I told her it's a sign stating it was $3.00 on sale. Carrie went to verify the price and she seen the mark down, but refuse to sell me all of the ensure which I had four. She only wanted to sell me two. I asked to speak with the manager and she stated she was the manager. I explained to her that I wanted all for price marked on the shelf and Carrie stayed she will only sell me two. I asked for the corporate number which she provided and she went back to the ensure to take down the sign. Carrie came back to the register and told me to have a good day. I said well I will buy the two packs. She told me to have a nice day again and refused to sell me the ensure which was for my kids and not myself. I have never been treated so horrible and/or been refused to be serviced at any retail store. I know she acted this way because of my race. Very poor customer service skills and I will not be supporting family dollar again.