A rude franchise owner and employee

Friday my friend and I decided to get a slider snack what what and to our surprise the meal was not as we expected like how we usual get our meal. The bun was cut in half and made into two sliders... Like an open sandwich. After a 20 minute walk we decided to go back and report the matter at the chicken licken (Diepkloof, Zak Zak) we get there I request that the meal be changed and not for them to close the same meal with the missing half buns. A lady called Lingile Dlamini if that's the correct name started yelling across from the counter and started being rude and we had a yelling session the manager tried to defuse the situation but to my surprise the owner of the franchise came and stood up for the lady that was actually yelling at me then ro get told that's how she speaks. I am frequent at this franchise also for someone that works with clients why is it deemed okay for a employee to behave like she's at a bar or she's talking to a child. I am so disappointed at how the employee and the manager managed themselves with a store full of customers. If this is the conduct then this needs to be reviewed