no stock, terrible service

We place a order on 12 of March which we made an EFT payment there after, i received an payment conformation on Monday stating estimated delivery date will be 16 March, when I phoned takealot to find out when will my goods be delivered cause i have not heard from the couriers the lady said that she will find out and let me know. I received an email just before 7pm stating that my order has been cancelled by takealot because they are out of stock and this is unexceptable really they could not phone us and say sorry we are out of stock we will order for you or something no just cancel my order how can they send me a email with a delivery date knowing they don't have stock, this is not right from Takealot i always order from them. I want this sorted out.