Woolworths online purchase not delivered and no refund received

I purchased clothes and shoes online from Woolworths on 22 July 2020 and paid for my purchase. The agreed date for delivery was 1 August 2020. On 20 July 2020, I received an e-mail notifying me that all my items are not in stock and only two of the four items will be delivered. Up to date, I have not received a refund from the items which were not delivered. I have e-mailed the customer services and online shop and up to date I have not received my refund or so much as a reply. When I addressed it at Woolworths Menlyn, I was informed that they cannot assist me at all and I just need to phone the customer services line until they answer, however there is no answer when I do phone them. I think the service received from Woolworths by firstly accepting my purchase and then notifying me that it is not available 2 days before delivery and then not even refunding me is very disappointing and bad service on their part. I urgently require feedback as to my refund.