The postponed and undelivered items

I ordered 4 items on 24 Oct 2018. The first delivery date seen 8.Nov.2018. After the delivery date passed, the Secretary phoned them next day about delay. They promised to deliver on Monday, 12.Nov.2018. During this time, the updated delivery date seen on the app is 14.Nov.2018. Then one more week passed and on 14th, we phoned them to cancelled the order. They requested to not cancel. They requested time till end of the day to find out the problem. But they did not phone back us as they promised. The next day on Thursday, 15th Nov, we phoned them to find out. Their only reason was supplier does not have stock. Takealot is not guilty. Do they have this right to waste our time. we ordered fans for the school. we waited 20 days in hot classroom. But the result is none. Thank you Takealot for the frustration and unbelievable promises.