I didn't like her attitude

My partner ordered Toast after he changed his mind&ask her 2 change the order,she said she can't change it,because she already done the sale.I had to take was he has ordered then he order something else.I don't have a problem with her saying she won't cancel the transaction,but I have a problem of her attititude towards us.she was not looking at us,when she gives us change she gave me while she's calling another customer.when we get our order,there was a mistake and she didn't bother and appologise.even to ask us which sugar do we want,she just gave us brown sugar and her colleague when she's telling her to appologise she didn't care and she walked away.