The calls I received at home (I'm over 65) falls under the medical equipment fraud department. The caller guarantees you a free brace or medical device free of charge, compliments of Medicare. They'll ask about your pain, and I think they'll hook you up with a cooperating "doctor" who will prescribe the brace and then bill Medicare. Likely at an over inflated price. The Medicare website has warnings about these type of calls.
I know the callers have my name and other information, Medicare recipient lists are readily available for purchase. So I don't do anything outlandish, just waste their time, and sometimes be a smart ass. You have pain? Yes. Where? In the ass. Callers like you are my pain in the ass.