Dear @deepak_dubey
You should contact the local police station where the incident took place or the District Police Headquarters of the Delhi Police to escalate this matter of mobile theft. You may also try to file a formal complaint with the Delhi Transport Corporation (DTC) about the lost item.
For more help, read: How can you file complaints or e-FIR to Delhi Police?
The appropriate police authorities have the resources and authority to investigate and hopefully find your phone. Keep patience, the police officials will notify you if they have any information regarding your case.
Remember, you’re not alone in this. Please reach out to a trusted friend, family member, or counsellor for support during this difficult time. Please remember that suicide is never the answer.