Home button permanently depressed, after the phone fell down

My Samsung Galaxy Ace II x (SGH-T599v) phone fell down and the home button is permanently depressed. The screen automatically flashes on and off due to this. the home button also does not function and when I press it there is no movement, indicating it has already been depressed to the full extent.

How do I get the home button functioning again ?

Do I need to change the button completely ?