Harassment from ex gf

Please help! I was in a relationship with a girl for short time for 2 months and long distance 4-5 months. We have been intimate 3 times that too when my ex felt right(consentual) My ex is in love with me but since due to lot of other issues and different paths as indviduals I decided to break up with my ex. I have met my ex personally explaining reason for not continuing and how it is in best interest of both.My ex has had a troubled past and is very short tempered by nature. I am being harassed and blackmailed continuously since my break up. 1. My ex threatened of suicide to which I begged her not to do something rash and coaxed her out of it. 2. My ex has threatened to tap my phone calls and get details from service provider citing that I have cheated on her which I have never done neither after breaking up have I seen someone. 3. My ex is making threat calls on my official number also and being threatened of getting me fired from job. 4. My ex is threatening me to marry her or face legal consequences. Please help I belong to a reputed family, I am scared for my safety and family too.