Insurance (Generali) shortens amount of expert (DEKRA)! – Right??

Hello Together, the following case: My father had an expert report with Dekra in a liability damage (BMW E46) as a victim. In this case about 1,500 euros (net) came out. The damage should not be fixed for the time being, but only net offset. However, the generali insurance wants to pay on the grounds “workshop comparison” where it calls surrounding car bodies only approx. 1.250 euros. When calling Gernerali I was “dimmed” there are enough legal judgments and your behavior In any case, we will now go to a lawyer. My questions in advance: Do you find the procedure of the insurance in general? We have no traffic law protection. Can it be that the case is not so clear and we remain on attorney’s fees. I am grateful for your comments. Greetings Toby