Dischem - unknowledgeable staff

Dis-Chem Pharmacies you promote the "better rewards" % off so much , can you take some time to train your staff on the basic math of how these rewards are calculated. I needed a refund a month ago and yesterday an item was incorrectly labelled and they needed to calculate the further rewards discount on that ..on both occasions staff could not calculate or understand how to do it. My poor experiences were at KZN stores - Hillcrest, Watercrest and Midlands branches