Very bad service

I was at the shop to purchase food, I bought a cold drink and on my way home I forgot that I must buy bread and went back and I took a bread and the cashier did want to accept my money because a piece of that money was missing and that money they gave me as change in same store, I started to do argument with the cashier and she then call her supervisor and guess what didn't even listen to what I wanted to tell her and pay all her attention to my cousin I was going with, 1 stupid thing the money they gave me it's not ********** money just that a small piece of that money was missing, those people are so damn stupid fighting over silly things, it means they only cares about money they are not interested in their client, the boody supervisor called Lesego and cashier Regina must call me and ask for apology, I deserve a it, I don't like to be treated like ******** while I'm not and store manager must call them to order this's 1st attempt to apology is fine from both of them, it's seems like managers are telling them how to treat customers.