Partial Insurance claim even after a zero-depreciation policy

My car was involved in an accident when an animal suddenly jumped in front. I was forced to quickly change direction and I accidentally hit the divider. The accident happened last year and when I took it to my dealership, they reported damages to the insurance company. The next day the claim survey was also conducted. However, the lockdown was announced that week, and I couldn't contact the dealership for a few weeks. Later, I was told that my claims weren't approved and since the workshop was closed due to the lockdown, I will be updated after it reopened. Two months later when the workshop reopened, I was informed that only a partial claim was approved even though my insurance had a zero depreciation policy. I have been trying to contact the dealership and the insurance provider, by they keep avoiding my calls and emails.