Refund not received on our Order

On the 29 Nov i made an order on the KFC App in Savanna using Two vouchers for R100, the driver got a wrong address from "Uber" and he asking us our address and was very impatient. The order was cancelled and returned to the store. An employee from the store tried to assist but he was told by the customer service that we have been refunded while we were not. I still dont understand how are they going to refund us since i was using vouchers. No one called since today.