"Very rude member of staff in the canteen!"

Tried to charge me for 4 adult portions of dinner, despite me requesting 3 of them to be children's meals. Apparently I had to 'pay for what was on the plate' and the portions I had been served by another member of staff were too big to be considered child portions. After I complained that that had not been my error, and I had actually questioned the size, double checking that it was definitely a child's meal, the member of staff in question virtually told me off, and begrudgingly 'let me off' paying for my own adult meal. How unbelievably rude!!! Such a shame as the meals were delicious!