Unsatisfied Customer

I have ordered an item through the Makro app and they specifically said available online only ,I've paid and I received a confirmation email. From then days later,my progress status stays on order confirmed. When I call the online centre they say they wil have this order escalated but nothing has changed. So yesterday I filled a complaint because I received no feedback what so ever after multiple empty promises and after I filed a complaint against the online department,that same nite I received a sms and an email stating my order was cancelled due to no stock availability,but when I go on to the website it still shows there's stock available online only. So who gave them the right to cancel my order after I filed a complaint. Makro is quick to take your money,but now I have to wait up to 10 days for my money back. How is that fair? I will definitely not buy from makro again unless they sort out there employees at the online department out....