Uber India — lost item (mobile phone)

I have taken a ride in bangalore from aecs layout to bangalore city railway station on 16-dec-2017 at 6pm. My mobile got lost in the cab. I called my number, the driver picked up and told that he will return the mobile the next day i. E. 17-dec-2017 but he didnt do that. I also raised a complaint to uber. Uber called once and requested me to wait for the day else they will ask the driver to submit the mobile in any of the uber office. Till today nothing has been done. I am fed-up of calling the driver, he just disconnect the phone or else dont pick my call. Even uber is not helping me resolve the issue. Nobody from uber caled me up. I am really dissappointed o[censored]ber as after committing me that they will ask the driver to submit my mobile in uber office and call me but till today they have not done what they committed.