Makro online orders are pathetic

Whenever I do an online order with Makro there are issues with stock after I have paid. I pay for all the items in my cart, few hours later i will receive an sms that items are out of stock. Why take my money when the items are out of stock. This happen every single time i place an order. Then, i have to wait up to 3 weeks for a refund which I had to fight for but yet they take my money immediately when I pay for the online order. I had to go into the shop to ask why i haven't received all my items (this order was for a friend), only to be told that the items were out of stock by the time I paid but yet once again they took my money for these items. Only then the refund were initiated. This was one week after I placed an order. Yesterday I placed another order, once again all item show in stock, few hours later I will receive and sms that items were out of stock. No email or an indication which items. Their online service is the worse ever. I have asked them to include alternatives on their app, so that one can choose something else incase the item is out of stock by the time it gets picked. I have been battling with this for over a year.