If you think you’ve been hacked and you’re unable to log in with your username and password, please take the following two steps:
1. Request a password reset
Reset your password by requesting an email from the password reset form. Try entering both your username and email address, and be sure to check for the reset email at the address associated with your Twitter account.
If you’re able to log in after the password reset, please check if your account has been compromised and re-secure your account.
2. Contact Support if you still require assistance
If you still can’t log in, contact twitter by submitting a Support Request. Be sure to use the email address you associated with the hacked Twitter account; they’ll send additional information and instructions to that email address. When submitting your support request please Include both your username and the date you last had access to your account.
I hope this information will be a great help.