Yellow sub, greedy company

Poor service, false advertising. They had things on sale last week Thursday, which I purchased and had another item cost R0.00 which I also added to my cart. But when they delivered the goods that item was removed and when I call to ask them about they said it was a system error. And told me to place another order and pay for another delivery which is so unfair and so selfish of them. They also needs to educate and fami****ise themselves with the Consumer Protection Act because what they did was ******** according to section 23 (3) of the CPA