cash net marketing call me on my job several times a day and for months cashnet marketing, Internet

cash net marketing has been calling me for months and several times a day claiming to have a law suit against me. They threaten me told me that i will lost my job and the police will come pick me up from my job. When call me he told me get a pencil or pen and write down my case number and his name was detective jack dawson. He talked to me very rudely and he cursed out my store manager. I feel harrass and scared to death, they ask me about my social security number and address. Their has be a law somewhere that prevents people and events like this from happening.