I detest calls like this. The voice recording says "our office has been trying to contact you about your medicare eligibility" I have never filled out a form with my phone number except for at a bank, clinic or hospital.
If I could find the office where this sort of organization was housed I would seriously consider destroying the building. I know guys who own sledgehammers , bulldozers and demolition equipment who would help. We could make it a sort of club that meets on weekends to take these a$$holes down!