UBER EATS CHARGES FOR ORDERS THE RESTAURANT CAN'T PROVIDE

I'm being charged for an order that I cancelled because THE RESTAURANT DID NOT HAVE STOCK OF THE PRODUCT. Uber says I'm being charged because it was cancelled after the restaurant began preparing the order which is ridiculous because they didn't have the product and I the restaurant and driver informed me to cancel it on my app after I was informed that they could not provide the meal I ordered. Worst of all is the app just stops the chat and you can't even contact them to speak to a human being