False advertising takealot/cancellation

On Saturday 25/01/2020 I made an online purchase of Xbox one for R522 order no: ***4. My transaction was succesfull and received delivery details for 7 th February 2020. At first i thought it was a joke but the confirmation was enough. However on Tuesday 28/01/2020 I received an e-mail from takealot stating that my transaction was canceled due to no stock. I know that if a purchase is done online ,immediatly you will know if stock is available or not. Takealot should take full responsibility if they made a typo error. Why is their problem all of a sudden my problem? I find it strange that if there is no stock ,why is the same add reposted but now R4999. But they out of stock. WHAT YOU SEE IS WHAT YOU GET. I saw R522. Politely they decide on behalf of me to cancel and I simply need to accept it.