Pathetic service

I forgot my card and I wanted to buy some snacks at pick n pay flora centre so I requested for a 100 cash back since I could use my tymebank app to get. The lady at the till said she doesn't have it I asked her to ask the supervisor she also said she doesn't have money. Went to the cigarette counter they told me they also don't have I must go the the liquor store. So the whole shop didn't have a mere 100 for a customer or they just didn't want to give me