Dollar Tree

I came in today to buy a card for my 9 year old son's friend. I was with my husband and 2 children waiting in line to cash out. I was the second person in line when another employee standing in front of me said "I can help the next person in line over here" ( the next register over) I moved my family over to the register and the cashier started to cash someone else. I said to her excuse me , hello , excuse me miss.... she persisted to ignore me and then finally looked and me and with the nastiest attitude said I need to wait . I'm not sure what this woman's problem was. I moved to the register because she offered to help me. After I went back to the original register I was at the cashier started talking smack, about how she hates working the night shift because of sh** like this and even got the other cashier to start belittling me. This was unnecessary and completely embarrassing, especially in front of my small children. I tried to get the employees name but was refused when asked. This is seriously horrible customer service. I should not feel humiliation just for trying to buy a birthday card .