Cancellation of order

Order on Takealot, Order no. #***, 13 Aug'23, constant checking on APP, today, 22 Aug'23, noted order cancelled, no communication from takealot. I called takealot to enquire the reason only to told no stock, why would takealot advertise items on APP if there is not stock, I would have sought the item elsewhere. Requested a refund, however have to wait 7 days, yet when purchasing takealot deduct immediately, really frustrating as now have to wait and additional 7 days then only will I be able to purchase the item some where else.