Payback on purchase & Healthy food payback

This is two complaints in one:<br> <br> 1). Healthy food payback - I've been receiving SMS's monthly about cash back amounts that I qualify for, but I have received none. I've been trying to resolve this since 09 Dec 2015.<br> <br> 2). Discovery says you receive cash back/loyalty points back into your preferred partner loyalty card for qualifying purchases. I bought a qualifying item 18/01/2016, still no cash back/points.