Cancelled order: waiting for refund

Ordered an airfryer online, few days later I got a call that they were out of stock, they will cancel my order. Why the fact that they were out of stock was not picked up when the order was placed. I'm frustrated with Makro and looks like it's a norm that one place an order, then gets cancelled due to stock being out and you've already paid for the order.

It's been more than five says now since my order was cancelled, I'm still waiting for my refund. How do you guys operate?