Navigation not working

I had gone to renault to fix my Navigation system as it had suddenly stopped working after someone who cleaned my car at a car wash accidently caused the SD card to be removed and so when i took the vehicle in they charged me alot to replace the SD card. I am currently on a maintenance plan which should cover these costs. I am very disappointed as i had my vehicle there about 3 times for the breaks and they just dont seem to do anything about it. Please could someone assist me as the navigation was expensive and it should not cost be anything to fix it