I have been receiving many calls since I made an inquiry about working at home (wish I hadn't ever done that) and have been getting calls from all kinds of what I perceive as scams. Be careful out there; if it sounds too good to be true, you can bet it is.
Go to the Medicare website and look for information on reporting fraud. There was a news report today about over 300 arrests of those engaged in defrauding Medicare like this caller is trying.