ABSOLUTE DISGUST

I placed an order with ubereats this morning for Nandos and it wasn't changing to 'preparing order' for about 10mins so I cancelled the order. The app said no charge but the funds weren't being refunded so I checked the receipt and it said the food was ready so I am be in charged. I then chatted to one of the consultants 'Nauman' who said the food was ready, there's nothing I can do, it's cancelled and refused to give me am contact number to phone and speak to someone. I sent another request explaining that the app said differently and they sent me an email to say that I am liable for the charges. I AM DISGUSTED TO SAY THE LEAST as they are holding me liable for an error o their app. We use uber/ubereats quite frequently as we are a big family bu we will never use them again, I have let everyone no how poorly this was handled!