Bad customer experience

I visited the Parow Center branch on the 22nd of December to do my gift shopping and noticed many of the cosmetics products were but 2 items and get 50% off the second item

I made a few purchases and left on my way out I noticed there was no savings and no 50% deducted from my purchases, I then headed back stood in the line and explained to the consultant that the 50% was not deducted to which she said the system does it automatically

I then advised that it's a secondary card so it had to be done manually, she then proceeded to remove the items and then add it up again by this time I was late for work but I stood and assumed it's fixed now until weeks later where I'm unpacking and clearing out my receipts noticing that The Cantu products had a sign buy 2 items and get 50% off the second item hence I bout shampoo and conditioner to get the deal

The shampoo was 199 and the conditioner was 199 the consultant did not take the 50% off the second product instead she took the 50% off the nail polish that was R29 and also buy 2 and 50% percent off the second one

So I lost out on a 100 discount just because someone doesn't know which products are on sale and how to manually discount these products

Please do better, this is such an inconvenience for the customer and really not a nice customer experience as a R100 savings in this economy is alot