Bad service from Woolworth Dash and refusal to refund my money

I bought grocery from Woolworths dash on 07 and 15 December 2023 which was never delivered. I have requested a refund which was never paid. On 12 February 2024, I made a follow up on the matter and was told the best option for me was to accept Woolworth voucher which I I agreed to. On 16 February 2024 I contacted them again and the lady claimed that a voucher waa send which was not true. I told her that I did not receive any voucher, she changed the story and said it was processed and she will escalate the matter. I asked for the details of her supervisor so I can speak to him/her, she refused to give me the details. Today on 17 February 2024, I have not yet received the voucher nor hear anything from Woolworth Dash after she promised to call me for feedback. I am very disappointed with their bad service and inconvenience. I need my money back, this is inconvenience.