In my experience they don't refund if the driver is 20 minutes late because they went the wrong way or because they decided to take multiple orders. I've even had them drop my food off at the wrong place when I was standing right outside my door waiting for them. The people at the other place tried to tell the driver it didn't belong to them but he just left it with them and left, my neighbour gave it to me. When I complained Door Dash said that because I got my order there was nothing they could do.