When I left my previous job, I signed a confidentiality agreement in exchange for a payoff. I released them from any claims of harassment, wrongdoing, etc. However, another employee is suing this company for harassment, and has subpoenaed me for a deposition. I do not want to lie about the sexual harassment that I endured (and left the company because of), but I don't want to be sued by my former company for violating the terms of my release. What should I do?