Waiting for my refund

I've recently went to randburg specsavers for my daughter's spectacles. I had to pay R600 for her eye test upfront of which I was supposed to be refunded because the amount of her prescription was paid in full including the eye test. I haven't received my refund yet even though I sent through my correct banking details, I've sent several emails but I haven't been refunded and not even a feedback as to when will I get my money back.