Dollar Tree

On the 6/15/19 My daughter brought a sprite, bottle glue and Father's Day card and the total was 3.79 and my daughter gave her 7.39 and her change was supposed to be 3.60 but the cashier didn't give her any money and we went back in to tell her and they counted the drawer and the other cashier told her she is over 80$ and then they turned around and told us that the registrar was equal and I said ok that's all right I will be calling and complaining on y'all