Canceled by uber driver

Ordered priority delivery from McDonalds. The first uber driver accepted my order and it said he was collecting my order. Next thing he canceled it I guess for a better order. It really makes me not want to support these guys anymore. Easier just to go and get it myself. I had to wait 30 minutes longer and my ice cream was melted and food cold by the time it got to me. These uber drivers should receive bad ratings but I can't even see who it was anymore.