3rd party claim processed with predudice

This is the 2nd review I am submitting over the same 3rd party claim I reported before. Even though the claims manager responded saying they will review the claim, it seems like there is a very poor level of attention to the information and evidence provided against their clients. Photos showing the road markings which their client failed to obey causing an accident is concluded that the claim should be taken to the municipality. How do I point fault to the municipality when I have no reason to blame anyone else besides your client for failing to yield and proceeding into an intersection whilst there is a vehicle crossing. Even with the clear images showing the road markings outsurance has resulted in not responding to the evidence as it proves their client is at fault.