Pick n pay waterfall mall unhelpful staff

Standing in your Pick n Pay Waterfall Mall store as I am typing this where I was just REFUSED to be assisted by a lady which I assume is your Manager for getting the discount on the Johnsons Baby Soap/Baby Club promotion. After showing her that I am a member of the baby club on the pnp app she just said well, it is done by head office so there is nothing they can do. So this is acceptable? This is how customers are treated? After showing all proof and then also sending the sms as it shows on the promotion advert I was told if it does not deduct automatically I do not qualify. I am waiting for an explanation and expect the lady and the cashier who did not even wait for me to leave before cashing up to apologize and wasting my time and for their unprofessional way of treating customers. THIS IS UNACCEPTABLE. And when reversing the point I wanted to use she still had the audacity to ask me if it is the same smart shopper, when she stood by the till through the entire transaction.