They have called numerous times, I can't even understand what the fellow is saying. I have told them not to call my number, but they continue to do so.

this person called asking for me and when my wife said no they just hung up on her

SUGGEST EVERYONE GO TO :  https://www.donotcall.gov/complaint/complaintcheck.aspx    AND FILE YOUR COMPLAINTS AT THIS SITE ALSO...    
IDIOTS called at 5:00 in the FREAKIN" morning.   Scared my entire household..   They were giving their whole script about school grants.   This is the 3rd morning they've called my house scaring the entire family.    I told them to STOP calling, LOOSE MY NUMBER, and hung up on them.   They called back at 6:00 AM and then AGAIN at 7:00 AM..    I never answered the other 2 calls.

Report them to the FTC then your state attorney general's office. They will provide you with a reference number. Legal action can be taken against them.

I received a call stating that the caller was from the US government in DC regarding a grant that I could be awarded in the amount of $8400. I informed them that I was not interested and to please remove me from their calling list.