Money taken, no groceries & no refund - almost 2 weeks now

I ordered groceries on 24/07/2022, had trouble with my card payment and eventually on the 3rd attempt my payment was successful. The app allowed me to resub payment and money was deducted however my order was cancelled and groceries were never delivered. I’ve called the call centre, was dealing with the manager Alfonso who promised a call back but never did. I was told that the numerous people I spoke to did not “void” the request therefore the refund was not in progress, I was then promised my refund by Monday 01/08/2022 and still nothing has come through to date. The only person that truly helped was the manager Jean from Checkers Hyper Centurion Mall and another gentleman from the call centre but I’ve forgotten his name. They’ve given me a voucher of R250 out of goodwill, but this is not enough. How am I going to be compensated for all the extra cost I’ve incurred?! I’ve got a baby that needs formula, I’ve got a family to feed and don’t have my essentials, this is a huge inconvenience. I’ve been patient but this is extremely poor service and disappointed. I'm not calling back again to beg for my refund, I need my money asap please.