Pick n pay Asap doesn't care about their customers, dissapointing.

I have purchased goods through pick n pay asap app on the 24th of October, the goods were never delivered as promised, their excuse was that I said I'm not around and surprisingly no one called me, I was tracking the driver and tried calling gge driver as I was seeing that he is getting lost, the driver never picked up my calls. So the customer service they said they will refund my money within 7 days, until today it was emails back and forth but my money is not coming through, they have suggested a voucher as well for the app and I said I will never use the app bcos of the past experience. I have given them my account details but it's now a month and they are very quiet about my money.