Sportscene refund not processed

On the 30th of May I purchased an AirMax Dia from Sportscene online. They later sent an email saying due to the high demand the sneaker is no longer available and that they will refund me. I’ve tried different communication avenues such as sending mails and inboxing them on Twitter to get my R1 799,99 and till this very day my refund has not been processed. Kindly please assist.