Takealot needs to improve customer service or lose customers to Amazon

I ordered a portable power supply on Takealot. I needed to change the delivery address and since the product wasn't shipped I didn't think it would be an issue, however I had to cancel my order and place a new order in order to change the delivery address. I then tracked my order after a few days and discovered that Takealot cancelled my order for the second time without informing me. Only on asking what had been the reason they gave me an explanation that they do not stock these products but have a supplier. The supplier I bought from did not have stock. The other supplier selling the same product was way more expensive. First supplier charged R1579. The second R5999 for exactly the same product. This has caused a huge delay for me. I work online as an independent contractor and need the back up power in order to work through load shedding. We never know when load shedding will take place. They didn't bother informing me at all in the process and will now not refund me the money so I can buy it elsewhere, nor did they bother looking for a different product for me. Their customer service is usually fairly good if there are no issues with the order but this is not my first experience with shocking customer service when there are problems with an order such as returning an item that is damaged.