Online ordering system and service deliveryorders@groceryexpress.co.za shocking!

Ordered 28 February after begging and pleading 10 days later they delivered half my order, brought the wrong cheese I ordered a 2.5kn block of cheddar and got frozen grated processed cheese. They pomised they would deliver the rest of my order in the next week, nothing and I politely followed up a number of times with no answer. I eventually told them if they not going to deliver to refund me, no answer. On the 20th March I was told the warehouse have given me a credit, again I told them I dont want a credit I a refund because I dont want to order online again again no response!