Am I in a war or restaurant?

On the 23rd of April 2025 I ordered a large triple decker. The lady who was assisting me chose to check in a small one, as I was sitting down I noticed on the receipt the amount was R84.90 instead of R199. I quickly went to her to rectify she started being loud telling everyone who cared to listen that all of a sudden I decided to change the order which was not true. She even said next time I order I must be loud, why take in an order if you’re not sure of what Im asking for? She’s very loud and honestly I came there for food not to argue with anyone. If I reciprocated it would’ve been my problem. Please fix it