Order not reconfirmed

This morning at about 8:20 I visited you Ballito Shop through the drive through . I ordered a breakfast wrap at R33. When I ordered I asked the staff member who was helping me if I could have an extra egg in the wrap instead of the chicken as I do not eat meat. She advised me that she will need to confirm so she got hold of another staff member to speak to me.

I asked if I can substitute the chicken for an extra egg or a hashbrown. I was advised that wont be possible they can add at an extra cost. I told them not to worry they must just remove the chicken from the wrap. Staff member did not reconfirm the order so I was under the impression that she understood what I wanted.

I get to payment station and I'm told to pay R37 as I added an extra egg told them that I did request the extra egg and that I will be paying R33. So I gave them R35 expecting R2 change back. I was told that I need to go park on the side as they need to redo my order. I told the staff member that due to time constrains I will not be able to wait and would rather have my money back. She told me that she wont be able to give me my money back because she had already put the order through. Does McDonald Ballito not have a void button on they system ? Further I will strongly advise that you staff members are trained to repeat the order to confirm that they have it correctly in order to avoid future mistakes.