No refund/credit for returned items.

I bought two pairs of shoes from Zando and they did not fit. I arranged for a return and a delivery guy came to collect the shoes but i have been struggling to get my refund since. I followed up with the courier company and they confirmed that the shoes were returned and they even gave me a waybill number which i gave to Zando with no success. No one is following up on the matter. The only way to get assistance is through their customer service email which is not helpful at all. I just want my refund because i returned the shoes.