If your account has been disabled does not mean that it was hacked. Facebook disabled it.
Some examples include:
• Using a fake name or not using your full real name.
• Creating two accounts.
• Impersonating someone
• Continuing behaviour that's not allowed on Facebook by violating the Community Standards
Read Facebook terms and Community Standards fully and carefully.
If you think your account was disabled by mistake, you can appeal Facebook's decision, but you must prove that Facebook made a mistake.