System can not ve changed

We ordered the starters of the 3 Course meal. Then realised it might be too much. we requested the order to be changed to the 2- course meal. The Manager refused to change it and informed us the system cannot be changed. "It is already punched into the system. Main meal Was not ordered yet. We were upset with the bad altitude and decided to only have the starter and leave. The system could then be changed to only pay for the starters. Really guys" This is a very bad altitude. I can understand if the mains were ordered. We will not return to this Dros in future