Hi, My account was hacked at the weekend and although it is locked the person still keeps changing my password and I am not able to get into it. it wont let me

Hi, My account was hacked at the weekend and although it is locked the person still keeps changing my password and I am not able to get into it. it wont let me reset my password as keeps coming up with an error message. I need this sorted and have had no help from fb even after reporting it numerous times