Insurance ****med

My niece's car was involved in an accident around the 12th August 2021 and she completed all necessary paperwork. The insurance company then authorized Supertech panelbeaters to repair the vehicle which was then taken on 24 August 2021. The repair company kept the vehicle for couple whilst saying they waiting for spares etc.The vehicle was then released to her on 16 December 2021 upon inspection she noted few discrepancies like an incorrect headlight fitted which unfortunately only stays on bright and cannot be dimmed as well as incorrect painting used. The bonnet was not even aligned properly. She then raised it with supertech who promised to correct it but never did. Its now 2 years the panelbeating company as well as the insurance company has taken advantage of a female. The repair company was authorized by the insurance and I'm not understanding how they were initially approved for repair if their workmanship is way below standards.