Double debited waiting for refund and no response from payflex

I used Payflex to pay for an order from Makro. In August, my second Payflex payment was double debited. I contacted Payflex immediately, and they confirmed the error.They asked if I wanted a refund or to have the extra amount allocated to my final payment, and I chose allocation.

However, by September it was still showing as a pending charge, so I followed up but received no response. Then, on 25 September, Payflex debited me again for the full payment. I emailed them again and received a reply on 29 September saying the matter would be investigated, but since then there’s been no update or refund.