Bad service on promo lines

Today, 9 January 2025 I went to buy some groceries and tried to take advantage of the promos they had. The cashier wasn't very friendly when I tried to make sure that the promos had scanned properly resulting in some issues where some products actually didn't scan. I also paid in full for the sunlight auto washing powder which was meant it be R69. What's more frustrating is that the cashier didn't give me back my till slip! Don't run promos if this is the result. Honestly frustrating