Customer service

I was doing some shopping at mall of Africa. As I was about to pay, I realised that I forgot my card in the car. I asked the cashier to give me 2minutes to go and get it and she told me she can't keep the items as the policy don't allow them. She will have to return them back to where I found them and I will have to redo the shopping again. I actual said I will be back as I rushed to my car to fetch the card and when I came back she was on her way to return the clothes back to where I found them. So, that means I had to wait for her to finish packing the clothes where I found them then redo the same shopping. So I decided to leave because I realised that @woolies doesn't need my money anymore. I asked myself what kind of a policy was that because even the supervisor refused to give me 2 minutes.Also, how many customers and sales is wollies willing to lose because of this policy.