Fist, go to this website www.donotcall.gov and register your phone number. Once your number has been on this list for 31 days, most of the companies will no longer call. If they do, find out the name of the person calling, the name of the company, the supervisor and the phone number. Tell them you are on the do not call list. Chances are, they will apologize, hang up and not call you again, because they are heavily fined if their name is turned in. However if they do call again, you can go to that same website and report them.