Good conduct not acknowledged

Pick n Pay clothing Walmer Park Shopping centre. I have never seen such unfriendly cashiers. Saturday I was busy paying for my items, then I saw a bank card (probably a customer's) still on the paypoint machine. I bring this to the cashiers attention, who did not even greet me when I had greeted, she doesn't even say Thank you, nor I'll be back, she rushes out and leaves me there, now since I'm the one who did the good act, don't I deserve acknowledgement of a good act, as I'm not sure if another would have done the same considering the reports of pickpocketing happening at these shops, and this particular pnp clothing bn one them. For the past 2 months iv bn buying clothes ath this pnp and never was I greeted nor Thanked by any of the cashiers iv dealt with. The people don't even know that it's because of me they got their card back, she probably said she found it. Tiffany Loots is the cashier in this matter. Thank you goes a long way