Worst experience, poor service and no care for customer retention

I ordered a product of Takealot almost 3 weeks ago and they gave me a confirmation of the availability, my payment and the date that it will be delivered which is the 3rd of June. I ordered knowing that the item will arrive since they are a reputable business and I have had positive experiences thus far. One day before the product is due to arrive, I received a message from them in the afternoon tsaying that they have canceled my item because there is no stock or low stock available by the supplier yet on the site the item is still available to be added in a cart. What bullsh** is that.

How is that possible???!!!

I waited so long and a day before they cancel. I logged a ticket and still have no response. Why the hell have I been given credit instead of a refund or do u not get a choice in this matter of having my money returned to me just as quick as the payment was made to them.