They ignore my request for refund

I ordered and paid for two blue and black cycling jerseys from the First Ascent Online Store for R1600.00. Then they sent me an email to tell me that those colours are out of stock, and asked me if the Charcoal colour would be okay for me. (So first of all they're online shop is not up to date with their stock availability). I rep**** and said, "No I don't want the charcoal colour,I specifically ordered the blue and black to match the rest of my bike and kit, they should please rather refund me". Then they went quiet. I have sent numerous emails over the last two weeks to try and follow up on why I haven't received my refund. I have phoned, and just gets passed from one operator to another with no help. I have left a voice message to the lady that emailed me, and she doesn't get back to me.