I'm very sorry this happened to you! I don't know how it works in the US but there is a commision up here in Canada for calls like that. If they call again, try to get him to tell you his company (I think they are required to tell you) and get in touch with whoever can bring charges against them. There is nothing more distressing than having to tell a telemarketer the've called someone who is no longer living. My grandma died two years ago and I still get calls for her.

I wish you luck - you are in my prayers and God bless