Ex - boyfriend Harassment ( my ex is forcing me to sleep with him)

I broke up with my ex 2yrs back. I used to work in different city and he was also in same city after yr n half we started talking n met twice to discuss abt our then partners. Then i came back to my home town as i am suffering from anxiety and depression. He also came back after a month. He msged me , we started talking casually but things got heated up and in the heat of the moment we exchanged pics. We then later decided to meet in private but i realised that i was doing i said no i wont come to meet u i dont want this. Then he started abusing me verbally and was threatening me that he will everything to my parents. But i told everything to my parents already. Now i dont have any form contact with him but he tried twice to call me from some other number is forcing me to unblock him so that i can talk to him. 2 days back he came to my house unannounced to scare me or threaten me that he will tell everything to my parents. My dad has suffered from cardiac arrest. Wat should i do?