Without groceries and refund

On 27/09/2022, Order: ***8 | I placed an order for delivery between 4-5pm, transaction/reserved amount went off my bank account followed by the driver tip. I later decided to update my order as the App allows for this to be done. Rainbow simply chicken has a special on chicken steaklets and other variations. I had selected steaklets and nuggets. I swopped out the nuggets for another steaklets pack as its 2 for R80. The price does not change. After the changed, a notification to make payment popped up, which I ignored as I had already paid. Moments after, I received a notification that my order is cancelled and payment voided. No refund or reversal has been received. I am without groceries and without money to purchase groceries elsewhere. I called their contact number, spoke to Alfonso who promised that the money should be reversed by last night and that he would send a transaction history to my email. None of this has been done. How am I supposed to feed my family while Checkers has my money?