Maruti Suzuki India — refused insurance claim

My car nexa ciaz aplpaha hybrid ch01bu1554 was met with an accident on 18aug 2019. Front bumper, right headlight and driver side door was damaged.
As i was told on purchasing the car the insurance was bumper to bumper and repair was done without any hesitation. But while repairing the workshop authorities only repair front bumper and headlight and refused to repair driver side door. They don’t give back any parts that was repaired.
Please help me to resolve the issue asap or i will seek any legal help.

Regards,
Trilok chand