Pathetic service

So I went to pick n pay in comaro crossing to buy a few items. I get to the teller she scans my items and I insert my card in the machine and the teller doesn't even bother to tell me their systems are slow after 3 a good minutes with my card in the machine with nothing happening, I asked her what is happening then she says please wait the system is slow. I asked her why didn't you have the courtesy to let me know? Then she gives me a sarcastic laugh and I asked her what was funny she rolled her eyes at me. SUCH DISRESPECT

I requested the manager to intervene but he failed to sort out my problem and the teller had the nerve to exchange words and talk over me the entire time. And she said it was just 3 minutes of waiting and why do I have a problem. I couldn't continue to make a fool of myself I left everything on the till and left the store with nothing after 10 minutes of pathetic service. Managers like that are not equipped to deal with real life problems all they know is sit behind desks and get paid.