I experienced an analogous situation tonight.
I was dropped off and noticed I didn't get an immediate receipt by email, as I ordinarily do. I did finally get a receipt that showed my trip ending several miles away. I contacted Uber, and within 2 minutes, received a professional apology and a generous refund.
The driver was a mediocre driver who gave the most brief of hellos and goodbyes. But his car was clean and he drove safely. I gave him five stars, out of reflex, but I noticed that he did not return the favor, even though I went above and beyond rider etiquette and even texted him where I was wearing at the exact point I was waiting to be picked up.
I now, of course, hope he perishes in a horrific single-car accident.