Method 1--go to the link:
Click on the button stating "My Account is Compromised". You will get following form displayed.
my Account is compromized
1.Enter the Email, phone or Facebook username of your account OR you can also choose to enter your name and a Facebook friend's name which was added in your account. Now click on "Search" button.
2.Now you have to fill-in your old Facebook password.
After entering the right login details, you will be asked to make your account secure and you have to click on "Continue".
3.At last, you just have to specify a new password for your account and you will enjoy your account back.
The second way to recover from Facebook hacking when you can access your phone number or email id is listed in steps below:
Now click on the option for "Forgot Password" or simply go to:
1.Fill in your correct details there to identify your profile and click on "Search" button.
2.Reset Facebook password
3.Choose any of the option which you feel easy to access including sending password reset link to your email id or Login into Google accounts to reset password or sending the code to your mobile number.
4.If you have received the code then enter it into the "Password Reset Code" field and press "Submit" button and you have thus regained access to your account.
The very first thing you should do after getting your account back is to change your email address and all associated password information that you think hacker can have idea of. Also I would suggest enabling all security mechanism options provided by Facebook to make your account more secure than ever and forever.