Young inexperienced and no customer service

.We bought more than R300 worth of hot dogs and chips from the food truck just outside Builders Warehouse Cape Gate. There were two girls helping us. It wasn't busy despite it being lunch time. We noticed the younger lounging outside and she was quickly called in when we arrived. We must have disturbed her sleep. Anyway she help another customer and got his order wrong. Then it was our turn. We wanted two sauces on and she obliged. Suddenly she started sighing and became frustrated. We didn't know why. We tried to calm her down and asked that she just takes a quick breath and relax. She was in a different state of mind. Didn't want to speak or help us further. We ask the older girl to intervene, it helps somewhat. We are not entirely sure why she reacted that way but staff are supposed to be kind helpful and friendly at all times no matter who upset your day. So that's the last time we support that food truck. We call on the owners to educate the staff especially the young school going ones or school leavers. It is very upsetting to go through such an experience.