Customer must pay for takealot's fault

I ordered a Hikvision CCTV Kit for R2299.00 on the 16th of April 2019. Over a weak later, on the 25th (1 day before the delivery), I got a message from takealot stating that this items is not in stock anymore and has therefore been cancelled. I checked the item online again and found it still being advertised but now from a different supplier at a much higher price of R3230.00. When i phoned them they said there is nothing they can do as the original supplier a third party seller does not have stock. So they are inconveniencing me for them advertising this item at the aforesaid price. Very strange if you asked me that it suddenly is not available and the price went up at the same time but may it be like it is.

After timorous & numerous phone calls with takealot's call centre. They finally offered to pay R250.00 towards the price difference. Which still sets me back another R681.00 that i need to pay.

I find it unacceptable to make the customer pay for the mistakes made by takealot. I as a loyal customer would expect them to pay the whole difference since the fault clearly lies on their side.