My last 3 orders I had with them, the service is unacceptable

My last 3 orders I had with them, the service is unacceptable. When viewing items on the Takealot App, the items clearly show that it is in stock, I select which items I need, and I immediately pay for it. Then after a few days I start to get emails stating that some items on my already paid for list is not availavble and will cause a delay, now a second item on my Christmas list is not available which causes a 2 week delay, and these items are my childrens CHRISTMAS presents, so now what the hell am I supposed to give to my kids? This is unacceptable, as this is not the first time I am receiving this poor service. What's the use of using their service if I have to wait 3 weeks?