Uber eats, unprofessional and *******.

We ordered from the online app for uber eats, when I went to the reception area to fetch the food, the delivery person Mamadoulahos started screaming at me telling me that I'm wasting his time and he's been calling for 10 minutes which was an exaggeration. He stood in the organizations foyer shouting, he then gave me R50 short for the change and I just needed him to leave as there were clients and colleagues around. I asked him what's his name, he kept quiet and I asked again and he said find it on the app. I then tried to find a contact number for uber eats as I need my money back and he should be a service provider but there's no contact details available.