lost item

I lost my phone and my prescription glasses in one of your cars, after being dropped off. I realised I forgot my stuff and tried contacting the driver. We were not provided with his cellphone number, we even went to the help option and chose the lost item option. 3 days later, after trying every day uber has provided us with the drivers number but he has not once picked up his phone. This is suppose to be reliable source and it is worrying because how many people has suffered with the same problem. Please help me with a possible solution as to how this situation can be resolved. I understand it was my fault forgetting my items , but it could have been prevented as we were not provided with the drivers Cell phone number, only a number that did not work after we were dropped off