Suffering consequences from their mistakes

I am very disappointed in Woolworths. I was in store buying food for tonight when your cashier rang up my meat twice, luckily I saw that before exiting the shop and she did help when I went back doing a refund on the card machine but that money is not back in my account yet. So now I have to wait for days to get my own money back. It wasn't my mistake, why must I suffer the consequences?