Not sorting out my insurance claim

Had an incident in parking lot in which someone damaged my car. Had to fix a scratch and back light. Panel beater fixed the scratch but said I had to wait for the back light cause it was not standard. Have been waiting for over 5 months for the part and they still can’t source it. Panel beater suggested we replace both back lights so the two match seeing as they can’t find the part. Miway is refusing to replace both lights as they said it was only the one that was damaged. My damaged have not been fixed and I paid the excess already. Are they honoring their contract with me to repair my car ie in the same condition it was before the accident? Surely they need to replace both light to fix my situation.