Identity Theft — Misusing my Identity

Address:

Bhopal, Madhya Pradesh

The user of mobile number [protected] is misusing my Facebook identity.

The person has hacked my facebook profile and chatted with all my friends and said delete my existing number and [protected] will be my new number,
which is wrong.
She is messaging all my friends and harrasing them. i am scared her intentions r not clear.

When i and my friends called on this number she is pretending to be me.

What shud i do please help.