What bad service and coming from a manager.....

I was at the Phoenix Shoprite branch yesterday 19.06.21 around 4pm I just finished me shopping while cashing for my items by the till point Robertson spice in the the small box was on promo for R10 normal price R19 the cashier then called the manager who came to the till point to cancel it while she was there I asked her is it not for R10 cause yourl have a promo bored on she just looked at me and walk away not saying anything how can you as a so called manager do that and the other Costomers was looking shocked if she cnt display management skills and Costomer service step down cause it's not right to just walk away when someone is talking to you I didn't see her name tag but she's tall short hair