Lack of communication

I placed an order online via the Nandos app on the 4 March 2024 for delivery. I paid for the order and used a voucher that I had. The app did not give me an option to select a store closes to me, it chose a Nandos store in vantage. 10 mins before my order had to arrive I received a call that they do not deliver in my area. I was annoyed at this point as I was extremely hungry but I understood. Nando’s vangate gave me a call and said that I had to email them my banking details so that they could refund me which would’ve taken place on the 6th of march. I emailed them the 8th and the 11th of March to find out how far along the refund process was and too this date I have not received any feedback whatsoever.