Can not cancel Takealot order

I ordered a package today at 13:54 and immediately paid. Just 30 minutes later my wife told me she had already bought the items i had ordered. So i wanted to cancel my order immediately without it having to be delivered. The delivery date is stated as 11 July 2022. And apparently you cant cancel an order at this stage and have to wait for delivery and then return it. Please help to cancel my order.