Delayed delivery continuesly

I ordered a 4000 watt inverter for R2999.00 on the 29th November 2022 and it was said to be delivered the 5th December then got moved out to the 8th December then it just got cancelled due to them not getting the item in. Then I was given a refund and was told to order something else. I then ordered a R3700.00 4000watt inverter where there was one in stock and paid and everything on the 9th December. It was said that I will get it by the 14th December. I was then informed via email that the item has been delayed and Wil only be delivered the 22nd December. I phoned customer care and they said they had none in stock and need to wait for it to get in stock. Maybe you should not have the components that are out on stock on your list so you don't have this problem. I have waited for so long now and yet asked for management to phone me let's see if they do. I will not do my shopping with takealot again