******* Takealot Suppliers

Takealot Suppliers are ******* like some government officials. I bought two chairs from takealot which was marked @ R199 each (90% off), the order was confirmed, when the goods neede to be delivered, the supplier suddenly was "out-of-stock" and the price corrected to R1999 (zero discount), I feel that the supplier made a mistake on the selling price listed and then marked itme out of stock to correct there mistake and left me out of the items i ordered, what can I do to make them give me the items at the listed price before correcting the price and cheated me out of my items?