Dissapointing refund service

Very poor and dissapointing service. The shoes I ordered was delivered shiftly but the size was to big. I requested a return and ordered a smaller size. My new order was delivered before they came to collect the return. On 4 September I received a mail to confirn that my return was approved, the shoes was collected but no further response after that. I have send an e-mail to follow up but still no reply. I paid with my payflex account and have 1 payment left and still no refund. This very frustating and Shoebox can learn from Superbalist when it comes to refunds on orders.