Nuisance

I feel harrased by 1 life agents,since this week has started they have been calling me non stop,I have been telling them I am not interested in their products but they continue calling me I don't know where they got my contacts, I blocked their numbers but they call using different numbers, I am sick and tired of them harassing me,the next step I am gonna do I will go the legal route. I asked a few of them to remove my numbers from their data base but still I receive their calls. Today only I received 4 call already...why m I been tortured like this??????