****med by Shoprite portshestone

HelloPeyer. I bought an esseintial combo at R99.I payed with a card.At home I notice that they charge me normal amount for the items and wrttine on the slip that"their system reward is dowm.that was on the slip on the shelf they are advertising promo.I feel like being ****med Ibought that because of promo.I DM on their facebook page.gues what first they said I did not buy all the items on the promo.After sending my card .I send the slip and wow everything was there.Now shop was not running the promo.I told them its a lie the promo will end 12 June was there on the shop.Please help me I want justice as a custommer.