Someone has been able to get into my Game Center account and has hacked me, I've changed my password and everything but he still finds away to get into my account, he changes my bio and stuff and I don't know what to do, I need desperate help :(

Question

I've been hacked and I changed my password but he still finds away to get into my Game Center and change my bio. I need serious help

Answer 1

Have you given your information to anyone?   Family, friend?
Did you have another device with Game Center on it?   Did you give a new owner of a device any passwords?
Do you share apple account with a family member?
Do you have a rescue email set up in your Apple account, with security questions? 
I suggest you set up a new email account, write everything down and keep it in a safe place.
New email account and password. Not so easy that it can be hacked.
In your iTunes account on the computer. Login and change security questions, password and rescue email.
Again, make sure your password is not easy to guess.   Same with security questions.
Write it all down and keep it somewhere safe.
I recommend a password keeper called Enpass.   You can store 10 cards with user names, passwords, notes and account numbers in the free version.
Then you only have to remember one complicated password to open Enpass and retrieve your information.
If all else fails, contact apple support.