Bought a product in August and still haven't received my refund

I bought an Airfryer from Makro online on the 26th of August. Because they say 2-5 days for delivery I contacted them on the 1st of September to find out when they are going to deliver, just to be informed that my order has been cancelled because the supplier couldn't supply them. I contacted them twice again about my refund and it is one lie after the other as to when they are going to refund me. I am still waiting for my refund and it is already the 12th of September. This is the worst customer service I received in a very long time, and I will never buy from Makro again.