Found some one on facebook and he claimed he is a licensed and insured contractor who agreed to do some flooring work. the work wasnt done right and made significant damages to my property. done a very sloppy job and threatening me they will put a lien against my property which i am going to list for sale soon. i do not have any written contract and he hasnt provided me his business name or insurance info. Is he has any legal stand in filing a mechanics lien in NJ ?