Loss of smart shopper double points

I think pick n pay should train their temps so they don't inconvenience customers because I have a smart shopper card to earn points. She redeemed my double points smart voucher but never scanned my card so I missed out on my double points. I only checked my slip when I got home and don't feel I need to drive back to the mall and waste my petrol if this was not my fault. She was also complaining to the packer that there's always a big queue there. I feel like she mustn't look for work if she doesn't love her job because I as the customer don't feel I need to hear her complaining about her job. She was also complaining about her superior while she was waiting for small change from her, really what happened to professionalism as a customer there are just some things that I do not need or want to hear. Someone else who is sitting at home will appreciate the job way more than her.