Cancelation of online purchase due to unavailability of stock

I made an online purchase of 3 items 1. 1.2 meters awning R499 2. Adapter multiplug R249 3. 5 metre extension cord R149, with surge protector plug. Had issues with Courier company, after more than 15 calls to the Makro call centre yesterday, no constructive feedback, found out issue was not with Courier company but with Makro canceling my orders due to unavailability of stock from the suppliers. However those items are still on the Makro website...apparently I was told the items are available from other suppliers. I don't have time to investigate ad I have a job to do. I do understand that they sell for 3rd party agents. Makro has very poor customer services for online orders. A distrustful retail company. No consumer redress.

So now the 2 items are cancelled 1. Why can't Makro get more stock from their suppliers.

2. The third item the 5 metre extension cord is still available. Now I am sure they will charge me a delivery fee as the price of the item is below R500.