air for the sits stop working on 2002 Mercedes-Benz CLK55 AMG

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
took the car to a mercedes dealer for the driver seat not working, when it came back the air for the cushions on the driver seat din't work. and now they want to charge extra. could you help me out. thank you, abe
(1) Answer
What parts did they replace the first time? What are they telling you is needed now? Also, did they have to remove and refit the seat the 1st time?