UberEats - cant make contact with them?

Emailed UberEats on *** regarding their app giving me problems and consequently had me pay twice for one order. Cant seem to contact them!!! Been to the FAQ page and it NOT HELPFUL!!! The email read:

A few weeks ago your app gave me a lot of problems after I placed an order. After trying to monitor the progress of my order, the option to view the progress vanished. So there was no way I could navigate to a place where I knew if my order was still on its way. Hence it seemed to me that the order never registered on the app. Consequently I completed the same order for the second time.

After completing the second order I suddenly got a notification for my first order - but still, when I went into the app it went totally crazy and I couldnt see what the progress was. So I followed the steps on your website and phoned the supplier/restaurant themselves. They confirmed that they would NOT continue with the second order, but I was still charged for the order. How do I go about claiming a refund?