Refund of R937 not efunded by Zara

I buy most of my items from Zara online however a few weeks ago I made a purchase with one bank account and it did not pay immediately I then used a different bank account. Later in the day the amount was paid by the first bank account I used. Meaning I made double payment. Zara does not have a contact detail you can only contact them through email or their social media and their chat service. I have not been helped or refunded. This really is a inconvenience, they owe R937.00