Incorrect orders from McDonald's viking

This morning we placed our orders and McDonald's viking. What a bad service by the lady that assisted ordered meals and got a burger only. Charged for a latte and received regular coffee. After repeating our self's over and over not sure if that lady was deaf and couldn't make out what she is saying orders totally wrong and didn't even receive a till slip. We had to ask several times for a copy of the slip. This lady needs training asap