Can I have my items

I have had the most unpleasant experience with Uber. I was in an Uber on Friday morning. I left my phone (on charge,with drivers charger) as well as my jacket in his vehicle. We contacted numerous times then he said he was busy with trips, thereafter he said that my phone is not there and that he does have my jacket but won't drop it off as Uber does not refund the R90s for drop offs. I let the phone go because he said he doesn't have it but I want my jacket which he agreed to having. He has now stopped responding to messages and calls. I am highly frustrated as no assistance was given.