Cancelled order and took my money

Last week a purchased something on Makro online. I paid via debit card. I ordered late Sunday evening. The money morning I received an email. Thank yiu for your purchase. Later the morning it says out on delivery then later the Monday afternoon delivery failed an hour later order cancelled. I called all week. The agents at the call centre are helpless. One agent told me there is no stick up ubyil today it shows on the online stock avaible. Mako took my money and have not refunded me. Every agent I spike to all week has a different story. Makro I want my money back. WHy cancel the order due to no stock and its still shows online available. I want my money back pleae refund it immediately I had it now