Payment going off twice for one order, and no assistance to reverse one of the transactions

Placed an order for a classic cheese burger at RocoMamas through the Mr D Food app on 19 February. Once the order was placed, the app went back to the home screen, and I got an OTP for the transaction going off my account. Going back into the app, I could not find my order. I contacted Mr Delivery, and I was advised to just place the order again, and if there was I double transaction, that the first one would be reversed. I have been communicating with them now for almost a week, I have sent them my bank statement to show the 2 transactions on my account. They stopped replying to my emails on Friday 21 February, and the first transactions has not been reversed. Very disappointed in the ****py service, and doubt if I will be using their services again