Poor customer service

I have placed an order and by accident ordered the wrong size. With a big struggle i manage to send them an e-mail to cancel the order so that i can correct it with a new order. It was told to me that i can not cancel the order and that i must wait for the item to be delivered then send it back and when they credit my account place a new order. This is not acceptable because then i have to pay twice for delivery and the items will only be delivered on the 18th of July as it is so when will i then receive the items... it will then be to late as i need the items asap for a function. You can not phone takealot as there is no contact numbers available. I really hope this complaint will reach the correct people so that this problem can be resolved.