Giving the wrong change 找错钱

The casher short change me 100$.
收银员少找我100美元

I didn't find the situation until I got home.
我直到回家才发现这个情况

I went back to the store quickly for telling the casher.
我急忙赶回商店去告诉收银员

The casher didn't refund me the money, because I didn't check over the money after she gave me the change.
但因为我没有当面点清钱收银员最后还是没有退我钱