they call every day just annoying as h--- what to do to stop such nuisance. On do not call list

I don't know who these people are..! They call every single day ,never leave a message ,and when you answer you have dead silence on the other end ...boneheads..! I'm sure most would say why do you answer then..? Well, I'm not in any debt ,so why not answer..? I like having a good time ruining their day..!  It's  kind of a hobby of mine... Nothing says Merry Christmas like irritating a telemarketer..!