To fix account hack issue, just join Facebook Support from experts
Your facebook account represents you, and it should be only accessible from you. If anytime you think that your account is hacked or some other person has taken it over, then you need to secure your account on an immediate basis. Your account may be hacked when you find your credentials are changes, your name or birth dates are changed, friend request sent to some unknown people, or something unusual happens without your consent. To overcome such inconveniences, we suggest you join our Facebook Support.