You may have a valid hostile work environment claim. You state that you have already asked your employer to do something about this, but the situation has not changed. At this point, your best recourse is to talk with an attorney who will get more facts from you and advise you on the best way to resolve the matter.
Yes, the first step is to read your employment handbook and find the section relating to your company's anti-discrimination and harassment policy. This policy should also include a complaint procedure. Make sure that you carefully follow each step of the complaint procedure. It is best to document your complaint in writing. It almost all cases, the company's policy will state that anyone bringing a complaint of harassment in good faith will be protected from retaliation. Additionally, our state's anti-discrimination laws and whistleblower statute also protects persons who raise complaints of a hostile work environment. For additional information, you should consult with a NJ employment attorney.