I have been informed by the CSA my maintenance is being reduced as Exh has now claimed a reduction in earnings as he pays through a salary sacrifice scheme in his job for a car. The CSA have taken what he pays to lease the car off his earnings before calculating the maintenance. He states that as he uses it for more than 80% buisness. This is not the case. He goes to and from work in it as he is office based. The car is a top of the range executive type car. His choice to buy when he could have as easily purchased a standard type car. Can i do anything about this?