Makro refund not paid after 3 months since the items were returned

I placed an online order for a wine purchase for an event In September. I ended up not needing half of the stock which was still packaged and sealed. So I submitted a return post the event. Makro collected all the stock and sent me a refund credit note, but to this date they have not yet made the refund payment. Each time I call them, I am told the matter has been escalated, but after 3 months, still no resolve. Very disappointing.