if its just not working as in press it and it doesnt get warm or no power going to it when plugging in chargers and sat navs, check fuse F44 in the panel on uk drivers side
if you've actually physically broke it (snapped / fell apart etc) dealer time or scrappy time to get a new one
mine kept blowing F44 so the lighter didnt work (light is on a circuit on its own) but as i dont smoke or use chargers in it after the 5th fuse and not finding the fault i never bother fixing it
I'd guess the fuse, as every Fiat I've been in have a dodgy connection there. The hole seems too short, so the plugs of the equipment we put in don't stick tight, the vibrates a bit and creates a short circuit.