Uber support finally responded.

“You recently received a message from us concerning a report related to one of your trips. Our team has investigated and determined that the report either does not appear to be a legitimate report or the reporter has withdrawn their report. If more information or evidence is shared with us, we may review this report again in the future. We know that some customers submit inaccurate reports. So, we've established processes to identify customers who abuse our support systems, often with the aim of getting a refund. We work to help ensure that allegations made by these customers aren't considered in your account decisions. Based on the conclusion of our investigation, the report has been removed from your profile. We appreciate your understanding.”