TAKEALOT.COM APP ONLY PRICE PROBLEMATIC

I placed an order on TAKEALOT.COM using their app, where special prices were offered as so called ''app only deals'' order nr*** One of the items on the app price was for JACOBS COFFEE @ R159.00; However, I was charged R199.00. The OMO detergent that I also ordered was correctly billed at the app only price. Numerous emails to TAKEALOT.COM were fruitless. Cannot wait for AMAZON to start trading in SA.