cashier was not helpful, I still don't have a lost card replaced

I went in the store to purchase and wanted to have a lost card replaced- I was told that I will have to call a number, I was not given the number to call and had to ask the cashier for it. She still expected that I pay for the items, but how? since I do not have the card?? I ended up leaving the items that I wanted to purchase. My question is that at Customer Service, are they not able to help while I'm still at the store ?