Uber Smartphone theft

Friday on the 5th of July I took an Uber with my brother from Crossroads to Phillipi. We got to our destination without any hassle. Here is where the problem is. When we got into the house my brother noticed that he forgot his phone on the Uber. We tried calling his phone if rang three times the 4th time our call we straight to voicemail. We tried to log into the app we traced the drivers number. My brother spoke him and he said he will get back to us because he has another client. He did get back. When my brother called him again it was the same story. Afterwards my brother told him he was going to the police the driver Said maybe he left the phone on the car was. Worse of all the Uber customer services have not been helpful at all its almost like they are protecting a ********.