That's a round conduit box. It's movement may have damaged cables, compromised an earth connection - who knows. You can't leave it like that, nor, even if you could, should you push it back up and assume all is well.
Then you'll have to cut the ceiling away - you need to see how the cables enter the box, and if they are damaged or might have been pulled away from a connection elsewhere, and you need to see if you have a conduit system which is providing the earth and check that it's OK.
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
