I've never had any of these problems at all with uber eats, probably part of why I use it so often. I click "help with a past order" and the first option I get is "my order was wrong" if I click it, it presents me with my order and everything I paid for and asks me what to pick that is wrong, it then asks for a photo if it's a larger $ item (unless it's missing) and then it asks me if I want a refund via card or credit, and as I mentioned, it typically gives me a credit for the trouble.

Super interesting to me we have such different experiences. Maybe because I have UberOne?