Pizza hut : Give a free potatoes

Last Sunday I went to Pizza hut with my family. Everything was ok, we ordered what we wanted to eat. But when we ordered potatoes wedges, the waitress asked us,"how many do you want? six or ten?". We were confuse for a while. Since when the potatoes wedges is determined by numbers? Maybe it's the new rule? So, we asked for ten pieces.

To our surprise, they served chicken wings to us. That wasn't what we ordered. Then the conversation began:
mother : "Sorry, we don't ordered this chicken wings."
waitress1 : "But you pick that chicken wing from the menu."
mother : "No, it's potatoes wedges."
waitress1 : "Ok.I will check it again."

Later...the other waitress comes with the waitress1
waitress2 : "Good night ma'am.Which one do you one? Potatoes or chicken?"
Mother : "We choose potatoes wedges. Anyway, can u changes it to potatoes? You still haven't out it in the bill, right?"
Waitress2: "Sorry.But it has already in the bill."
Mother : "Ok. Wrap it and we'll bring it home then."

The waitress went away. We were half away eating while the waitress came back again and gave us a plastic box filled with chicken wing. Then the unforgettable moments comes... They gave us potatoes wedges for free! The waitress said that this is the apology because they place a wrong ordered. :)