pacpac

Hi everyone ,I'm new here and I hope i can find an answer to my problem: I have a 08 plate C5 with hydroactive 3+ (I think :) ) and like I don't know what is the problem with the front suspension. To start with the beginning,one morning I found the front part of the car to the ground,but the rear was normal...I tried to rise the suspension from the controls,but only the rear was working (up,down) so I took it to a local garage where they lift it up to have a look underneath.nothing seems to be out of place so they lowered back down.when they did this,the front suspension was stuck,but on the high position now.the rear works fine Anybody had this problem before ? Thank you