Citroen Xsara Flywheel Problems

FIRSTLY WHILE ON MOTORWAY WE BROKE DOWN AND CAR WOULDNT MOVE ,STARTED FINE AND WENT IN AND OUT OF GEAR JUST WOULDNT ACCELERATE .. MECHANIC CHANGED THE CLUTCH AND DUAL MASS FLYWHEEL .... NOW CAR WONT START AND ECONOMY MODE ACTIVE DISPLAYING ...

I cannot separate the gearbox from the engine because its semms to be "hanging" on something inside. Any idea what it could be ?