Enquiry to AlphaTech store to refund me

I did a payment to AlphaTech to purchase a macbook for R10000. They kept giving me runaround on when they will deliver the product. After writing a lengthy message to them, they finally told me that they do not have stock at that moment and they have ordered for me. Fine, I trusted they will deliver than the following week they told me that the model I want is not available and they said if I do not want the product they will refund me. I asked for a refund and today is a week and they have not refunded me my money. I send them messages on WhatsApp but they do not reply anymore but on social media they post when customers have received their packages clearly showing their chats but here I am being ignored