Live with accidental Takealot order details!!

I purchased two books last week for delivery. Unfortunately, I neglected to select my own address and inadvertently selected the address of a person to whom I sometimes send items. I only realized this when I received the email confirming my purchase and IMMEDIATELY called Takealot (and sent them an email) asking them to change the delivery address. I was advised that once a purchase is paid for, no changes can be made. I was told to cancel the order when I received the SMS advising when the delivery would be. I NEVER RECEIVED THE SMS and on checking the order details on Takealot this morning, I see that the delivery is being made today - to the Northwest Province, while I'm in Johannesburg. It is totally ridiculous that no changes can be made to an order, especially when a mistake is discovered immediately after placing it.