First, report it to the police. Second, if it happened on the job or while you were in the course and scope of your employment, report it immediately to your employer. Third, document every instance and scenario of the sexual assault. Keep note of times, dates, locations, and dialogue used. If it occurred on the job and you do not feel protected by the HR department of the company you work for, please reach out to a lawyer to take the next steps. A lawyer can help represent you and sue the opposing party if needed.